"...Three quarterbacks? That's not a solution. That's a cry of desperation."
To be honest, whenever I get to thinking about this lately (for eg., when I'm WRITING about it) the same conclusion comes to mind. For now and the remainder of THIS season, I think Reed would consistently get better results from THIS offense and line-up than Brantley has or will, especially inside the redzone, and Burton can do a lot of things that offer that offense more options while making his presence confusing to the opposing "D"--but in the long run, you're right: it isn't a solution.
We need a quarterback that can run the Spread, WHICHEVER version Urban creates, adapts or returns to. That's the simple, straight-forward answer, and we don't have one. Maybe Driskel will be that guy. Whether he is or whether it turns out to be someone else we don't even know about yet , the bad news is that "HE" isn't here yet, and even if we were to know tomorrow that such a one was a "lock" and on-the-way, we'd still just be about where we THOUGHT we were before THIS season--just "older and wiser" and more realistic, better aware of what this offense needs to try to be. The good news? Well, we DO have all those talented young "O" and "D" playmakers from successive top recruiting classes coming along, and another batch looks to be on its way; if we WERE to actually LEARN from the mistakes and experiences of this season, adapt accordingly, grow up and grow together as a team, NEXT season's outcome would likely be considerably different than this one's.
However, a team so young and without an established on-the-field leader even at QB, the key position on offense, will depend all the more on vision, strength, and clear-eyed leadership from the coaches who command everyone's respect and trust. I just don't see how that happens without some variation on the big and basic changes we've talked about here.