But he still took the money for it. That's modern comedians for you, mercenary. Moaning about the quality of your vehicle make you a hypocrite.
Changing actors is a contractual thing that still happens in US sitcoms because the series are so long, it's a bit hard to avoid. But when there's a bit hit show like Friends or Frasier I believe they make the actors such huge offers with a loyalty dividend that means they effectively double their money if they stay till the end.
In Britain we have things like loyalty to a show people love, I believe a thing that made Jason change his mind about leaving OFAH. Only fools would leave, eh. Good morning.