In the case of no sequels or remakes, I can agree there. It's not a matter of running out of ideas as it is that those ideas sell. Trends tend to happen because they're usually safe bets. On the subject of something actually new... well, everything's been done. Basic story structure basically dooms you to repeating the same "someone has to do something or get to somewhere," and all the paths have been traveled before. The best you can hope for is subversion or creative solutions that tweak the story, but having a similar outcome every time. Be it a big blockbuster movie or a small indie film. Even the most experimental art film you could make would have some similarities to another, even if it's completely unintentional. We've been telling stories since we could first communicate, and everything owes itself to something else.
Now, what those who claim to want original movies are actually saying is that they want more lower key, slice of life type films about people. And those aren't that original either. Better made, perhaps, but even they all feel a bit like each other no matter how good they are.
Seriously... you do not know how many indie comic writers I've spoken to (and some are so indie they're Kinkos published) that have the same idea of "Super hero nerd gets super hero powers" punctuated every time with "be careful what you wish for." Now, they don't all communicate with each other, they all assume it's their original idea (even then... kinda used before, Gizmoduck in Ducktales for example). I'd love to say to each one of them that I heard several other comic writers come up with the same exact concept, but that would be kinda mean. Granted, they'd all be slightly different, but they'd also be very similar. That's the part of unoriginality that cannot be helped.