He may be and he isn't finished yet.4 titles in 7 years...Is Saban the G.O.A.T? A strong argument can certainly be made that he is.
Bryant gets bonus points for having success both before and after integration (not easy). Saban gets bonus points for winning in scholarship limit era (also not easy).
This whole unexpected chapter of Saban turning the offense over to Lane Kiffin (and Lane Kiffin hitting it out of the park ... with two average QBs in Coker and Sims) I find incredibly impressive. Alabama (Alabama!) wins a national championship executing an offensive gameplan designed by not just Lane Kiffin, but Lane Kiffin and Chip Kelly (Chip Kelly!). Aren't very many coaches period, let alone legends of the game, who are that adaptable and open to experimentation.
Bill Belichick and Coach K come to mind, but it's a rare trait.
The only guy I could rank ahead of him is Bear, and honestly, I think Saban will surpass him before he calls it quits.
Bear Bryant won a mythical National Championship at Kentucky. Saban didn't do that at Michigan State.
I think Bobby Bowden has to be included in the conversation. 14 years in a row with top 5 finishes and 2 titles (and played for I think at least 2 others). All-time winningest coach (or did Joe Pa pass him finally?). Saban's great and an all-timer but I'm not ready just yet to crown him GOAT.
Agree with the difference in eras point - Bryant could offer unlimited schollys and a lot fewer teams took football seriously.
Bryant probably should have won a MNC at UK, but no titles were awarded at the time by any entity. It was at least half-a-century later that some individual on the internet decided to play what if and go back and retroactively claim UK champs that season. Regardless that seeming injustice, I think the Bear is still widely considered the best of all time. However, Saban can make a great argument. He has won 5 titles at 2 schools and has only 1 less than Bryant. He has as many or more NC's than such legendary coaches as F. Leahy, B. Wilkinson, W. Hayes, J. McKay, D. Royal, and T. 0sborne, all of whom won or shared at least 3 widely-recognized national championships.