It is a bit of extrapolation, and I acknowledged that. That said, it's hard to argue that "who can be mezzed" *is* becoming a smaller and smaller circle - not even of specific ATs, but of powersets inside those ATs, and then of course Clarion's effects. Which are, granted, temporary... but given how much Incarnate content is also league-size content, that temporary-ness is offset somewhat (and that's ignoring that whatever might mez *you* has an entire league's worth of targets to choose from as well, making it less likely that you'll be that target. After all, that's kind of the point - or one of them - of tanks on teams, as well - to gain that attention and push through it so that your squishies don't have to. The tank becomes almost literal mez *protection* for everyone else.)
The ramp up ... hmm. Is an interesting idea. I don't think it would have a huge impact on *my* playstyle, since where it ramps up is probably where I"m in a longer fight and would hit domination anyway (or, hey, teamed and the mez love is getting passed around) but it wouldn't be detrimental either. I'd be interested in seeing what it does on test, at the very least.