With all due respect to the OP, I disagree.
Even if we win the Super bowl (truly a pipe-dream this season), we wouldn't be rolling with Cutler next year. He would be in his upper 30's, coming off several less than healthy seasons, and probably would want to ride into the sunset a Champion. We'd probably still start Tannehill. And anything short of that, we'd definitely start Tannehill.
Now, if Tannehill has some sort of medical complication, which I seriously do not expect, then we might look at drafting a QB, but if Tannehill is healthy, he stays. Now, if we totally tank this year, and draft high, we'll likely roll with Tannehill and trade down and collect a bundle of picks from a team that actually needs a QB.
But the bottom line is 4 things: 1) Cutler will be significantly older and less healthy than Tannehill, 2) Tannehill probably has another 8-10 years left, so we're unlikely to replace him, 3) Gase isn't likely to start a rebuild in year 3 after winning 10 games with Tannehill in year 1, so I can't see us drafting a QB, and 4) in today's NFL, ACL surgeries are almost always successful and the player comes fully back in a year.
So, I don't see a scenario where Tannehill isn't the top option. I recognize that uncertainty scares people, but this isn't a Tony Romo / Dak Prescott situation where the replacement is a young guy. This isn't like a Drew Bledsoe / Tom Brady situation. Cutler is older and ready to hang up the cleats. Tannehill still has a few years left and seems much more durable aside from this one knee injury he should have had surgery on last year.