Let's talk about this statement for a bit: First you imply that "free" updates MUST come from "optional MT", in which case, the alternative scenario would be no updates if the MT did not meet the required of funding. This of course is NOT implied by Blizzard (if it was please point them out), which would mean you're making this all up just to guilt ride the people who are against MT in the first place.
Then there's the issue with $60 price point. Yes, games are getting more expensive on the run, but this is entirely on the scope of the developers and they are NOT required to go higher than what they can afford. If Blizzard could sell even 5 million at $60, that's 300 million DOLLARS, even taking the 20% share out for keeping, that is a lot of money for 1 game, especially in this generation. Going by the beta, reception they can make much more.
The point of MT is that it justifies an alternative funding for FREE games. That is when your argument makes sense. Just because you go AAA doesn't automatically mean charging a full priced fee gets to have the same benefit as well.
Just imagine the world you live in where MT's are mandatory for the escalating scope of development. That would mean the AAA industry is going to be even more saturated that it already is, because not ALL game genres resonate with MT receptions in the same way.