^Good call on the Tapis Volents. They should take the opportunity to relocate them into Adventureland. The could even put them under a canpoy (similar to the Sultan's Carousel in TDS) just to make it a bit more thematic.
Soarin' would be a great addition to Discoveryland - maybe replacing the HISTA building.
And if not Journey, what about the other Mysterious Island attraction; 20k Leagues Under the Sea?
None of those options would be cheap, but they'd refresh Discoveryland a little bit.