I have no idea if he was expecting to be fired but it could be a move to jumpstart his career. If he can go win alot at UH he could get a real Power 5 job (compared to WVU).
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My guess was that he either felt it was time for a change of scenery and/or he was tired of the challenges there. At WVU, his best QB was a UF transfer who didn't even play the bowl game. Now he can basically walk across the street for talent in Texas.
WVU hires Neal Brown of Troy. His teams weren't flashy, but productive. They were 31-8 in his last three years there with wins at LSU and Nebraska.