At this point, it is hard to see him even being Practice Squad worthy. I suspect the Bills will comb the waiver wires, and other team Practice Squads, looking for a good 3rd option.
The problem, however, with the another "teams PS's" is that they would have to put that person on the 53 man roster. With the many bubble battles going on, and the likely potential of keeping an extra WR, TE, O-lineman, DT, or even D-back, I don't see them them wanting a 3rd QB on the 53. Thus, a waiver guy to the PS is most likely. Tyree will have to do well these next two games and hope no other attractive options becomes available to the Bills.
It will come down to, who can we safely stash on the PS?