What new classics have we declared off-limits?
There Will Be Blood (2007)
Why someone would want to remake it: Writer-director Paul Thomas Anderson has gone on record saying that the film is only partially based on Upton Sinclair's 1927 novel, which could possibly serve as the inspiration for a very different, yet still familiar, adaptation. Likewise, a potential remake would look like an Oscar magnet for the leading men of of the future.
Why they shouldn't: Anderson's ambitious period drama takes place in a pitch black universe, with Daniel Day-Lewis' one-of-a-kind performance as Daniel Plainview as the black hole at its center. It's a complex, thunderous and terrifying performance that's rarely been matched in the history of the medium. Don't even try it.