Why don't we kill two birds with one stone and add bugbears in there too? That way when and if they gets updates we don't have to make another proposal. That's also let people people that have them know their character is safe from nerfing.
As far as oversized and brutal, it's only one weapon that brutal gets better. In others it in fact it gets WORSE. Take craghammer a jump from d10 to d12 means brutal triggers less often. With a quick scan, only the executioners axe is an offender with it's d12 turned to 2d6. This could easily be fixed by changing the die of an oversized executioners axe to a d14 and then all weapons would get worse if they are brutal and oversized. Quite honestly I don't know why this wasn't done instead of banning the combo.
As far as MM vs dragon. The issue is that if someone had every official book with errata, the only official minotaur is the MM one. As such, there would need to ba an errata of the MM to alter it. Without DDI access that's all you'd ever know. And that leads into everyone NEEDING ddi access...
As for as just making everyone have to use PH3 minotaurs... I have mixed feelings on this. I am NOT a fan of the MM minotaur. Some of the feats aren't bad but what you got instead of oversized was like a swift kick to a sensitive part of the body...
However I'd normally say a book update should void earlier book rules... If I HAD to vote, I'd go for the 2 minotaur option. I hate the new minotaur enough to let it slide.