All writers have been running out of ideas, whether they're movie writers or book writers. And it's been going on for a few generations now, too. I mean look at romance movies. They're all based on a woman and a man falling in love and some kind of obstacle between them. EVERY movie and book is like this, you just have to find something new to add to it. On the other hand, you can keep the clichés just as long as you're really that good of a writer.
No, because there a lot of great books that have never been put to film, King's Dark Tower books, Donaldson's Covenant chronicles (my favorites) but Hollywood would rather remake movies that were questionable the first time, Dred, Total Recall; really, wasn't once enough.
With new generation comes new ideas. Main problem for new people is that they have to start under shadows of great people and it is very difficult to start your own name. There are well established big names like Speilburg, James Cameroon, etc. and it would not be surprising if their work is carried forward by their children or relative. Whenever a new person with innovative idea comes up, he faces problem of funds. See, a writer writes a script, he takes it to agent, and after many editing rounds it is finalized for film. Film is made, and big names of big people comes in starting of credits, and name of that new person is last and comes in small. So, that's how, people with ideas are not able to come up, and it is one of the reason why some of the new movie are totally baseless.
I think the problem revolves around the fact that society is demanding to watch what is being put out there. There are creative writers out there, but the movie business is market driven. Look at all the reality driven programming on TV that is being churned out. This is what society wants to see and you really don't have a choice.
Hollywood has, yes. But independent film companies are continuing to put out excellent work, if you like good stories portrayed by talented actors. Lion's Gate Films have some really good movies but they have started to go more mainstream too.