So what have they done lately?
I think you're proving the point. They're an empty shell of their former greatness and should be put out of their misery to make room for whatever great thing is to come next.
Not even counting foreign films, here are some darn good productions from the past five years:
Midnight in Paris, Hugo, Drive, Warrior, Black Swan, Inception, Inglourious Basterds, Up, Whatever Works, The Limits of Control, The Dark Knight, WALL-E, Gran Torino, The Wrestler, No Country for Old Men, There Will Be Blood, Into the Wild, Ratatouille, The Departed, and The Prestige.
Pixar demonstrates that it's possible to make 10 movies without 5 of them being terrible. If the rest of Hollywood knew what it was doing you would expect the same quality from Sony pictures etc.
PS: Pixar is hardly the first company to fund things internally raise the bar. You can find other studio's that used that model and produced a lot of decent films one after another. It's just that after a while the people running things don't really have a taste for talent and they can't handle the risks.
That is despite the fact that installment movies of James Bond, Star Wars, Toy Story, etc., that year.
Everything seemed great that year. Or perhaps if was also a good year for me, and therefore everything seemed good because of that...
Also, since Taxi Driver by Martin Scorcese was mentioned, take a look at his latest film Hugo. I think you'll agree it's every bit as good as his earlier work.
Will that impact the quality of their titles? Well, their last film was Cars 2... not exactly a high water mark for them by any measure.