I also do not see any more original ideas out there working for another series. It's too soon at any rate, in my view, to do another series so close to when the last originally aired, and with the movies now basically the onscreen experience for fans to enjoy if they want to.
Are you kidding, all sorts of ideas could work. And how is it "too soon" to air another series? Show people something kick-ass and engaging, and you'll suddenly have a market for it. Since when do people not want to be entertained?
The real problem is that space opera in general is dead on TV, so that would be a huge disincentive to CBS taking a risk on Star Trek
on TV. The entertainment business works on herd mentality, which is why we get more cop shows and remakes than there could possibly be demand for.