I love the B&B idea as well
As for me, I've always wanted a Pinocchio flume ride that goes through Monstro - perhaps it could even be in the water parks. Which brings me to my second point - why isn't there Disney characters in the water parks? There are several movies or movie scenes that could be used (Little Mermaid, Nemo, Swiss Family Robinson, etc.)
Since Hollywood Studios is moving towards Pixar I'd love to see Crush's Coaster from
Disneyland Paris & the Monsters Inc. ride from California Adventure. I'd also like the Indiana Jones ride from Disneyland (one of Disney's best IMHO), and perhaps updated shows. The Toy Story show everyone raves about from the
Disney Cruise line may be fun.
Animal Kingdom - whatever happened to Mythical Creatures? So much potential. Also, I'd love if Disney added World of Color to the lake, making AK a night park as well.
EPCOT - provide rides or better shows for each country. Keep Mexico. Update the Maelstrom - it needs to be refurbished. As for the rest of the countries there are some obvious directions. In Morocco an Aladdin Magic Carpet ride would work splendidly. In China a 3D Mulan show. Perhaps in Italy my beloved Pinocchio flume ride idea could be applied. In England several different ideas present itself- Mary Poppins, Peter Pan, Winnie the Pooh. Canada - a Brother Bear show perhaps? In America what about a classic Mickey attraction? I agree with the OP for France. Also, how about adding a few countries? So many fantastic ideas have been referenced in the past, but my personal favorite is using Greece (re-creating the Parthenon), and having a Hercules attraction. I always had loved the idea of Egypt, but for now it may be better to put that one on the back burner.
As for the Magic Kingdom the potential is endless.