The whole Delete thing is symbolic. It's a step he has taken. Let him do it.
Everybody knows Blizzard will restore everything in a heartbeat if he ever wanted to come back.

For some, playing 2-3 hours a weeks lacks the great feeling of achieving anything significant. that's where you start adding too many hours and then start feeling bad about it.
Lets face it, WoW (like any MMO) is desgned to be a time-sink. And that's exactly what it does, and it's the best at what it does.

If you want to keep playing, keep playing. If you want to quit, quit ;-)