I disagree with you about 2001, but aside from that it was well said.
But that's my point exactly. Like I said, I can see why people consider it a great film, but it does nothing for me. Just like there are people who find Kane boring, overrated, etc. The idea of coming to a consensus opinion about art is generally rather silly. Not that it stops people from making up lists, because they're fun to do. I know we did a similar exercise here a few months ago, which was interesting. It's more fun to see what other people have chosen, frankly.
As for why Kane continues its hold on the top spot, that's an interesting question. Part of it no doubt is the simple matter of Kane's brilliance, but maybe the other part is just a hesitation toward the idea of a new "greatest film ever". I mean, how can one film go from being the best to no longer being so good? Sooner or later, the backlash will come and Kane will be dethroned, and it will likely come from people disenchanted with the idea of no film since being better, and get Godfather, 2001, or Vertigo, etc into that spot.
It would perhaps make sense to retire films from the poll, should they wish to continue it, as David Thomson suggested in an article on Kane. He wanted it done for different reasons, it seemed, but as Rosenbaum commented, films like Kane, Godfather, Seven Samurai, 2001, and so on no longer need to be trumpeted as great-we all know they are, or at least most of us agree that's the case.
Rambling post over.