As an anecdotal aside; Star Trek is still pretty popular over here in the UK. TNG currently airs on three different channels (SyFy, CBS Action, and The Horror Channel), and TOS, Voyager, and Enterprise all air on various channels. DS9 is currently the only Trek show that is not being broadcast in the UK.
You know, it's funny, and arrogant, how Americans think that it is only about what occurs in America that affects the decision making in corporate board rooms.
I'm reminded of when Disney released the 1960's
Spider-Man cartoon on DVD back in 2004. In the US Disney's main headquarters wasn't interested in remastering the series (even though they owned the original film negatives), and was content with reusing the old masters for the series that were made back in the 80's/90's by New World. I don't know whether Disney USA just wasn't interested in remastering the series or they didn't forecast much profit from it, but they didn't remaster the series. (Disney had already released 2 DVD's using the old masters---albeit the episodes had been put on as bonus episodes).
However Disney's International arm in Europe decided to budget the remastering and cleaning up the episodes of the series under their budgets, rather than getting the go ahead from the main US offices. What happened is that now,
Spider-Man'67 is available all over the world because of Disney Europe (Buena Vista International Television) doing the remastering themselves because they saw a chance for more profit from the series, and that they would be able to promote the series better, even if it was standard definition copies of the series, because of the massive clean-up of the series. And because of that restoration for UK and European audiences, when Disney released the series in a Complete set back in 2004 in the US and Canada, those of us in North America were able to benefit with episodes that didn't look like we were viewing them on a TV in a smoke-filled bar. And even today, on streaming networks and TV stations people are still able to rewatch this classic series in the best quality that the have ever seen.
And I even remember way back in the 1990's when Sailor Moon was first being translated into English. Even though the series was being translated in Canada, executives at DIC were only looking at American figures, where due to timeslots the series was not doing that well, and was cancelled after the 65 episodes had made its run. However, in Canada and other English speaking countries the ratings were huge and the series was a good success, and based on that, even a toy company stepped up at the time and offered to pay the cost of translating the rest of the 2nd season into English, and after that the next 2 seasons were picked up by Cloverway and translated in English before Toei said that they wouldn't license the final season.
And on the live action front, within the past decade there have been two shows that I can think of that, while they were Canadian productions, they were both aired on a network in the US, but the US Network cancelled both
The Listener and
Flashpoint, or in the case of
Flashpoint, moved it to a "sub-channel" that is not received in every part of the US (ION), but the series continued to be produced and aired on a major network (CTV) here in Canada. (From what Wikipedia says,
The Listener, while NBC cancelled it after 7 episodes in its first season, continued to stream the series on its website till the end of Season 1; during the later seasons ION signed on to co-produce the series.) Even back in the 1970's,
The Persuaders was cancelled by ABC for it's poor ratings (and it wasn't that much of a ratings hit in its home market of the UK, but then it did very well in other international markets to make it profitable right after principal photography had wrapped).
So international markets do play a huge role in market decisions and profitability for TV shows, despite what many Americans claim.