I actually think Bay may have screwed up his career as a director with Transformers. It seems that the studios don't want him for anything else and whatever other movie he wants to do, is only under the condition he makes the next TF film. Since nobody really cares or likes anything else he has been doing, I think he has become a repeating one trick monkey.
His career as a director may have been cornered on the toilet end of the floor but that shouldn't affect him that badly. The money that TFs gained him has allowed him to buy a lot of horror franchises. Yes, he makes awful movies out of them but he still owns them.