Yeah, I've wondered about this myself.
I believe that Saban's goal in coming back to college is to improve upon what he did at LSU. They did win one NC there in Baton Rouge, but they were hardly considered a dynasty, and I believe that's what he wants at Alabama. He knew all the other things were in place already; fanbase, facilities, precedent for repeated success. Alabama was a one-of-a-kind job, comparable only to a Notre Dame, Michigan, or perhaps USC. He wants to build a dynasty here. His quest for a repeat next year will be relentless.
So, I say all that to say this: Saban might not allow that statue to be erected just yet. It's the ultimate ego move. Usually, an ego that large would jump at the opportunity to be immortalized in bronze, but he wants to one-up what he did at LSU first, and perhaps even what other coaches at Alabama have done. Of course, 6 national titles with Saban already at his age is probably unrealistic. But he wants to be mentioned alongside Bryant, Bowden, Paterno, et al, and to do that he needs a dynasty run.