I don't believe the govt should step in. It is a local problem, between the teachers and their city. If govt did step in, then it would set a precedent of govt stepping in to solve their problems.
Rush Limbaugh's speculation is that Obama is waiting until he can step in and be the great mediator by getting the teachers to accept an 8% raise; and tell everyone that the teachers will be evaluated, but then the latter will never actually happen. Things will be happening behind the scenes, so that, if and when, O steps in it will have been pre-agreed upon.
Yes, Rush is a crazy kind of person; an entertainer. OTOH, one wonders that Obama has had no comment at all. He was quick to comment on the stupidity of the police in CT and how Trayvon Martin might have looked like his own son ... yet on this he has been silent. It seems out of character.