Well, how long are they going to mute you for? If they mute you for an hour, then there's no lesson learned. If they mute you for a day, still no real lesson learned. And as far as anyone who's actually paying money, a week may get them to be a bit more cautious, but still it's probably not going to stop them from acting like a stick. Anything beyond a few weeks is just annoying, and if it's setup this way for even the smallest violations, it won't be long until you just say duck it.
I actually like the new system as long as they truly plan to stick by it. I think it's stupid that if you broke a rule once you could be banned until Ducking 2022 like I'm really going to play Habbo when I'm 26 years old. It's a virtual game, I didn't commit war crimes, I advertised a retro. This system at least allows for an extra chance, if they stick to it and apply it to all rules not just the minor violations.
I do understand what you are saying though, it can cause problems down the line as far as too many people being banned and become an annoyance to the point where more people quit.
If you ever want someone to quit, call Sulake, they'll do it for free.