When should this move had been made?

[Murphy3]

It looks like most people are in agreeance that the coaching change was a good thing. My question is this: When? When do you think this move should have been made and why?

For me personally, I can honestly say that Nellie needed to go sometime during last season. His use of Walker and misuse of Dirk pushed me over the edge. I'd never been a huge fan of Nellie the coach, but I've always appreciated what he had accomplished here in Dallas. But, I honestly believe that he delayed Dirk's career by at least a year by making him take a back seat to Walker. Obviously, there's a hole in my opinion. Who would have coached? So, maybe during the season wasn't a possibility.

Hey, that's just my humble opinion. When and why do you think this move should have been made?