The problem is, we should never have encouraged the Syrian opposition in the first place. Assad and his regime where fairly benign by middle eastern standards, and would have evolved on a much shorter time scale than most of the other states In the middle east.
Him and his missus loved a bit of the western way, so was easily manipulable within reason.
Now whats done is done, and frankly needs to be fixed. Personally I would like to see some groveling back up to him and Western boots on the ground.
Personally I think stop fighting against him, and our troops on the ground in Northen Iraqi.