BB has a pretty std strategy when he has a surprise shortfall in a position: 'throw everything (multiple draft/FA/UDFA) at the wall and see what sticks. '
Now with QB position, the league has made it too key. So i am sure BB will try to draft an heir. But if it looks like that heir is a Sanchize in TB's last year; he will hope out and get a solid FA QB and draft another qb too. He got to 11-5 with a backup before, so I could see it happening again with an avg FA or rookie or 2d/3d yr developmental.