I think it's a little too early to throw in the towel just yet on those who are not 'in.' One can sound very brave when not faced with actually having to DO something - but I predict, when the potential of actually kicking that bum out of office is REAL, they'll screw up their courage and get the job done.
And I wouldn't pay too much attention to polls what say the president's is still 'likeable.' Given the racial tension on the country right now, it's the easiest thing to do to say you 'like' him. I also predict that people will just say they 'like' him to shut people up, but privately vote how they really feel.