I dunno, I think the Tour is a different beast than any other bike race, in the sense that it's about pomp and spectacle much more than it is about having an amazing parcours, which is why there's always this love/hate thing about it with year-round cycling fans... I'd love to see the world's best riders on the world's best course, but those things never really match up.
For what the Tour is, it makes perfect sense to finish on the Alpe for the 100th anniversary - the spectacle of the Tour is all about celebrating the country and the history of the race, and the Alpe is - deservingly or not - the most iconic climb there. Sure, I'd love it if they used the opportunity every year to find new and interesting climbs more than they do, but that's a separate criticism. For the 100th Tour anniversary, I'll forgive them that somewhat unimaginative choice. Ventoux didn't turn out to be the way most of us had hoped, but that was largely due to the fact that the guys in 1st and 2nd couldn't shake each other, so they were more looking out for their teammates who happened to be competing for the final podium spot. C'est la vie, but it was still exciting to think at the start of the day that anything could happen.
Agreed that the 'celebrating making it to Paris' is an important part of the Tour, and has become history in the last 40 years or so since they've been finishing on the Champs, but going further back, I think that having a huge MTF to finish the Tour does much more to honour Henri Desgrange's original vision of the Tour as the ultimate individual test of endurance. From everything I've read about that guy, Lapize was right in calling him and the other organizers 'assassins', but the Tour was his vision and he'd hate the fact that the final stage has been more about sipping champagne and riding easy for all but 50km. I'm into the idea of using the Alpe.