I think the Feds are going to take one last run at shutting things down before public opinion forces them to cave. I don't think it will come with Mr. Obama's blessing, but rather in spite of his best wishes. His appointment to head the DEA, Michele Leonhart, blew up in his face to a great extent because- so the story goes- she apparently deceived him as to her real feelings about marijuana legalization.
They'll crack down again, there will be a big public backlash, and then it will be rescheduled. Just a guess...
On the subject of guesses, the Repubs could win the White House in the next election and decide to really crack down. Big public backlash, Los of public gnashing of teeth, similar ultimate result- only longer, more drawn out and ultimately more muddled. In short, typically American.