SFO is on the small side for a base and there are currently a number of standing bids in for it on the RJ side. Doubtful someone would get it on the RJ for a while. There are only 4 EMB FOs there, all on reserve, with only 1 wanting to transfer in. It wouldn't surprise me if someone got SFO out of training.

For the RJ, it's much more likely that you'd get MSP, IAH, or ORD. If you didn't get your choice of those out of training, it propbably wouldn't be more than a couple of months before you could transfer.