In patch 5.4 the Vale is going to be completely dry so the whole life on Pandaria is in danger. Also it's still too early for the next expansion so patch 5.4 doesn't have to be the last one in MoP.
Maybe Blizzard will make patch 5.5 focused on rebuilding Vale and the whole Pandaria. What do you think? Would you like to see something like this and do you think it's possible?