No, they can't. Do you know why Disney opened its resorts in southern California and Florida in the first place? It's called "weather". One does not make a profit on a huge, expensive theme park that one has to close down for six months of every year due to snow and rain. California and Florida have mild, temperate climates all year round.
Furthermore, shutting down Disneyworld, with all its decades of VERY expensive building and development and going off to build a whole new expensive theme park somewhere else, just because *sob,sob* they have to abide by the same legal strictures as every other corporation would be the stupidest business decision in the history of ever.
Bottom line, I think the state of Florida can withstand the hit a lot better than Disney can.