I wouldn't mind seeing the Sleeping Beauty ride replaced, because it doesn't exist in the first place :-)
As for the Snow White ride, I was thinking ahead. It would be great if the Seven Dwarfs Mine Train coaster that's opening at Walt Disney World in 2014 eventually came to Disneyland Paris. It looks like a ride that the whole family can enjoy together; rather than being either too kiddy (Casey Junior), or too thrilling (Space Mountain). It should appeal to all ages. So, if it came to Paris, our Snow White dark ride wouldn't really be required anymore, because quite a few of the attraction's scenes are replicated in the new coaster.
As for Iron Man, I meant it would be built in between CinéMagique and Stitch Live! CinéMagique is a great attraction, it just needs a better exterior, a pre-show and a digital projection system.
Tron: Legacy could be "old hat" in a few years, true. But Tangled is a keeper. It's really one of the best animated films Disney has ever made, on so many levels.
Also, you said if the park is modernised too much it may put off some older fans. But consider this. The most modern film with its own permanent attraction in Fantasyland is... Sleeping Beauty from 1959. That's a film from 52 years ago! If you look at Disney's ticket pricing, they state that childhood ends at 11. So in those 52 years, 4.7 generations of children have grown up!
So, I think Disney SHOULD modernise the park, fast. Even The Little Mermaid is 22 years old now! If they wait any longer, The Little Mermaid will known as the film your Grandmother grew up with!