There have been PLENTY of wars since that mechanic was removed.
I didn't say that there hadn't.
Indeed, many places saw a rise.
I think all that can be said for certain is that some realms, relieved of the burden of the badly-designed TMP penalties, were suddenly able to start wars they had been wanting to start. That is, I would call it a surge of wars (short-term), not a rise in the number (long-term).
If some !@#$%^& concentrated in one of the many continents don't care for fun, it shouldn't be a reason to go screw everyone else who plays the game. TMP caused a lot more harm than it did good, I'm quite glad it's gone.
I agree with this, as I think I've made clear before. I just think we need something to replace it as an incentive to war—nothing so heavy-handed, of course, and maybe some adjustments to region recovery should be part of it. But the problem of risk-averse rulers preventing wars because they're afraid of losing what they have is a real one.