I played a different game with a fatigue system and that was CRAP.
The reason being is I want to choose how many hours I Play in a day.
THe fatigue system forces you to play X hours per day to fully take advantage of your play time.
That means during the weekdays when I was busy I couldn't fully fill up my fatigue but when I had more time during the weekend I'd end up filling my fatigue up and then being forced to not play when I have more time!

So no, if that system is brought back I know I would quit for sure. It's nobody's business how much or how little PAYING players are going to play a game.