On one hand, I was thinking Disneyland opening up first would help quell the crowds in Disneyworld just a hair- at least from the massive fans. But I think it's going to actually make it much, much worse- in particular now that RotR is going to be pushed back on both coasts.
My prediction:
The May 31 hype train at DL will have social media, news stations, etc abuzz. Everyone will see how incredible the land looks and show their kids and spouses "See- we need to go to Disney World". They see it opens August 29th, they schedule their trip for later in the year.
The levels of insanity we are going to see for this are going to be unprecedented. Like nothing we've ever seen.