Well, SR had solid sales on dvd. I really think that people like you are just
proyecting your dislike for this movie; you really
don't know how the mainstream feel. I mean, did you ask every one who went to watch the film?
Do you need to ask every person in the world to get a general feel of anticipation for a sequel or franchise? Films that are
loved are being talked about months and years after the movie's release. You don't need to hold polls and surveys to know the public reverence of films like TDK, POTC, ST, Hangover, etc etc. These are movies being brought up in random convos for whatever reason.
You are completely wrong about my feelings for SR. I came out of it thinking it was good, but not great. As time went on, I grew to be more disappointed because of the hugely missed opportunity in creating another culture splash for this character. What's worse is SR did nothing for the character in terms of the superhero hierarchy. Bats and Spidey are
still the crowd favorites by such a wide margin.
The general public still views SR as somewhere in the neutral zone. They're not lambasting it, but they sure as hell aren't on the edge of their seats asking for more asap. They went to see it, and they moved on. No more, no less.
And SR was a character-driven film, still it made more at the BO than ST, which was all full on action.

Now imagine an action-packed sequel. I think it could have been great.
SR was going off the character name and interest in a possible reinvention ala BB.
ST was going off....a niche franchise that is considered the geekiest of the geek.
Supes (as a character) is still bottom-rung in audience's eyes. Star Trek is now considered
cool and fun, and is no longer a turn-off. Is it that hard to see what each property did for their franchise?
Whose drop-offs were lower and which film got better critical/audience reviews? That says it all for a sequel's potential. If SR2 and ST2 were to come out tomorrow, I guarantee you no one in fandom would place much bets on Supes winning, judging on the overall reactions from the first films of their respective series.