I've talked to a few folks in the training department and hiring, and it doesn't sound like it's out of the question...but that doesn't mean it's a sure thing. Won't know till you sign up.
Each of the guys I'm talking about though are former Trans States, and former Captains on the 145. All have at least a couple thousand hours with the company, and 500 T-PIC...but we'll see.
However, I think the biggest win for TSA on this is that it suddenly makes many more FO's competitive for a CQFO position...so I imagine these spots will become a bit more competitive to get, and they're now able to entice a whole group of folks who previously weren't qualified to make the jump.