It sometimes happens that we are having to scrape the barrell for a starting QB - that certainly happened in 2013 when we were down to fourth string walkons at the position. Ideally, you want depth, but if you are having to play your third stringer, then we are in trouble anyway.
The good news is we have two young QBs the coaching staff clearly likes. If we run a two QB rotation, though, we are going to have to find some bodies at the position.
I'd keep an eye on the recruiting wire and see whether QBs pop up as having scholarship offers. If Lincoln is leaving, it may also change the coaching staffs feeling about the possibility of a transfer player.