Webb is still only 26. He has a the next 5 years ahead of him for great racing.
My own opinion of Alan is that he has completely exhausted his interest in the mile, its become quite frustrating for him.
He should try 5k and 10k, or even the 3k.
Maybe he just needs a change of scenery. Anyway, I think the guy still is a major talent and I hope he turns things around for the better.