I think this decision can partially hinge on any pressure BA feels from ownership. First of all, they have to decide if they are keeping BA, I think they will. The next question, is ownership happy with the results this season, mid 80 point team, missing the playoffs. If ownership isn't happy with that, BA can kind of make AT the scape goat, coaches get the axe first usually. If BA on his own isn't happy with AT and the results, he will make a move this summer and fire AT.
This will be interesting because BA is all happy go lucky with the team, performance, right where we should be, year 4 of the rebuild even though its year 5. If everything is all good, why fire Bear, things are great? Maybe this is only BA's 3rd year, since the first year shouldn't count for him if it didn't for BA.
The team has never really over achieved under BA/Bear, the low points are always ok, because we have a young team, just wait until next year. The pretty inconsistent play we see down the stretch, I think, is partly because the team is misconstructed, but it could be a coaching issue too, along with young players maturing.
If BA has ownerships backing, I think he keeps Bear. But if this team stumbles at all next year, be ready for a mid season coaching change, if we aren't solidly playoff bound. BA will need to pass the buck at that time, or else he will get the blame.