Depending on who you talk to, you will be told the failure to return rate for ML pitchers that undergo TJ surgery is anywhere from 5% - 15%. Those are pretty good odds of recovery, especially when you consider the majority of the ones that don't make it back fail to do so because of a lack of effort or dedication to the recovery and rehab process involved. Judging by Strasburg's personality and motivation to return, it seems even more unlikely that SS will be part of that small percentage that fail.
The news sucks, but they are building a good stable of young pitchers in the minors. Unfortunately none of them come close to the level of Strasburg.