My nuanced take on Whitehead:
1.) The decline and fall of Maine hockey was going to happen regardless, due to economic and demographic factors well outside his control.
2.) Despite that, he probably needed to go to confirm that he wasn't the issue.
Shawn Walsh was a once per generation coach. Maine came on the scene at the right time to be able to spend gobs of money on having top notch facilities and budgets as compared to the rest of college hockey.
Unfortunately, Shawn's death coincided with the time when bigger and/or richer schools got more interested in hockey and started spending more money on it, and a decline in the fortunes of Eastern and Central Maine as a whole, which reduced Maine's ability to keep up with the Joneses on all the off ice stuff.
Without one of the 3 or so best coaches in the game, Maine hockey was always going to turn into the sick old man of Hockey East. Still, it was worth seeing if a coaching change would inject some life into the program. Whitehead had long enough to show he couldn't turn it around. Whether Red was the right hire, I don't know.
Looking back on it, the run of national championships by LSSU, Northern Michigan and Maine was absolutely bonkers.