After reading some of the other responses and re-reading the OP, I admit I was a bit harsh in my first response. Clearly I didn't read the OP closely enough.
My bad, apologies to you.
Actually it is a good question and can be looked at in two extremes with a continuum between the two extremes:
1. Is Tannehill good enough right now to lead a solid team to the SB and will the team be solid enough in 3 years?
2. Will Tannehill be good enough within the next three years to lead a flawed team to the SB?
IMO, 1 is a partial yes right now. IMO, he is as good as several QBs that have won SBs. Whether the team can fix all the other flaws (OL, running game, run defense, etc) is another question and nobody can answer it because Hickey is so new.
2 is a harder question about Tannehill to answer. Will he be Rodgers, Brees, Manning, or Brady in the next three years? Probably not.
The real future is somewhere in the middle. Tannehill will improve and give the team a larger margin of error. The team will hopefully make other improvements and also needs some good fortune. Will that be enough the win the SB within the next three years? Probably not, but IMO, it won't be because of Tannehill.