I don't know how much CBS is like BBC1 here in Britain.
Probably not much. CBS is the most successful of the networks (overall, network TV is in real trouble, especially NBC and ABC) and has achieved that success by showing three types of shows: police procedurals; mass-taste sitcoms; and reality TV. Because those genres appeal to a very wide audience, CBS expects any new shows to measure up to a very high ratings bar. They'll cancel a show that gets ratings that would qualify as a hit on NBC and might be three or four times as popular as a hit show on Showtime.
In the past, CBS has pussyfooted around with sf/f genre TV, like
Jericho, apparently because there was some feeling that they needed to have a nichey cult show in the mix. But nichey cult shows get puny ratings compared with what CBS is used to, and they seem to have gotten past the idea that they should care about sci fi at all.
CBS is riding high now, and they probably don't think they need to stick their necks out and take any risks, since the conservative approach has paid off so well. But they have the oldest average audience of any of the networks, something around 50 I think. Advertisers don't care about anyone over the age of 49, so that is a big problem for CBS, and the other networks are aging right behind them (with FOX and especially CW skewing much younger.)
So the thing that will finally push CBS to change is when the realize their audience is dying out from under them. But there are many other approaches they can take to get a younger audience short of jumping into a new
Star Trek series. And this realization may not hit them for a few years.
With stations that are considered to be main players and lesser ones viewers you often have to pay for.
This is how American TV works: the five networks are free (CBS, NBC, ABC, FOX, CW) and you have to pay for everything else. (Technically I also pay for the five networks since I have cable and it's all on the same bill, but I could dump cable and get the nets for free.)
Since the networks make money from advertisements, where each viewer is not worth all that much, they are stuck chasing a mass audience to get survival-level ratings. But cable is shaping viewers' tastes so that they expect to be catered to, and networks have lost a lot of their audience to cable (it's 50/50 networks/cable now).
On cable, some or all of the revenue comes from subscriptions, which means each viewer on basic cable (TNT, AMC, FX, etc) is worth more than network, and even moreso on premium cable (HBO, Showtime). As the value of the viewer goes up, so does the benefit of catering to the tastes of smaller numbers of viewers vs the mass market.
There is a very striking correlation between quality and niche programming. The fewer viewers you are forced to chase, the better the series will be. Most likely, this is just the result of greater creative freedom on cable, which in turn is made possible by the cable business model. If that's the case, it can't be translated to network TV, which is stuck making less interesting/mass market junk forever.
Networks are in such dire trouble that some networks have hired execs from cable to help turn things around, and several of the new network shows seem c
able-y - Pan Am, Playboy Club, even
Person of Interest which seems like a departure for CBS. But most of the risk-taking is happening, predictably, on the networks that are in the most trouble: ABC and NBC.
Then the question becomes, are the networks simply rearranging deck chairs on the Titanic? If their ad-based business model is the reason their programming is so bland, then trying to ape cable will simply result in cable-level ratings, which won't pay for network shows. In a few weeks, we'll start seeing the answer to this question.
CBS sticks with police procedurals, inoffensive comedy, and reality TV because those are the "12M tastes." Other tastes, for horror or historical fiction or space opera, are going to be inherently less common and therefore probably not a good fit for CBS.
Who's to say Star Trek can't be adapted to fill a void the CBS line-up doesn't cater to?
There are plenty of tastes that CBS doesn't cater to, but the real question is, are those tastes common enough that they can get, say, 12M viewers that CBS expects of its shows? When ENT was cancelled, it was in the 3-4M range.
I sincerely doubt it could ever reach 12M even in the best of circumstances. The whole green-aliens/starship thing is going to be inherently off-putting to a large proportion of the audience. To get
Star Trek up to the 12M range, you'd have to jettison everything that makes it distinctive. Why not just accept reality and make another cop show instead?
A much better approach would be to put
Star Trek on Showtime (and don't worry, it wouldn't have to have obnoxiously amped up sex 'n violence - there might be more sex and violence than on network TV, but it's not like Showtime has a minimum requirement).
On Showtime, getting 2M or so is a great achievement, especially if a lot of those viewers are first-time Showtime subscribers who are motivated to subscribe because they are fans. The success of
Game of Thrones on HBO - a book series that has a fanbase but certainly not as large as Trekkies - suggests that Showtime/
Star Trek would be a successful combo.
The trick is, convincing Showtime of this. They might look askance at a franchise associated with free TV, as not having enough of a high-toned image. Showtime would have to give
Star Trek that image, and that might not be worth their bother.
The key to getting
Star Trek back on TV is to put it on an outlet that already has high-caliber shows, with a compatible business model that will permit it to be the quality it should be, and is willing to at least think about a sci fi series. That means Showtime, which has the advantage of being part of CBS, but also in theory, HBO, FX, AMC, TNT and (if it's an animated series) The Cartoon Network.