Love is still very young in his ability to read D, adjust, and make plays happen. He is a very good QB when things are there for him.... I don't see much in the way of adjustments, and he has very poor situational awareness.
The result is very sporadic offense. Sometimes he plays like he is on fire, but when he is being challenged, he doesn't change coverages, look for a quick "out", or hurt the blitzer's area.
Yes, with a very, very good defense, you can win a SB with him. But I think his chances are low until he can play "smarter" football. You are going to have games where everything goes your way (Dallas last year), but then you have other games where it goes badly and I don't see a QB that can "will" his way to a win.
Hopefully he will get there, but until he does, I think he has a very low chance of being a SB winning QB. (Hopefully I'll eat those words).