I find that using the argument of "if they fix X problem it will make 4v4s a huge gank fest" quite negligible.
Why?
They already are a gank fest. I've yet to see a player consistently win a 1v2+ situation. And maybe that's just for the time being while players learn how to properly gank. But most ganks i've taken part of the victim gets obliterated even by activating revenge numerous times. So when players learn how to properly gank i doubt that any sort of decent patching will fix the problem. The gank fest will be eternal. So it's either Team fights, gank or being ganked.

Maybe there are those that can pull off a 1v2+ more often.. But the OP states HIGH LEVEL PLAY. If by HIGH LEVEL it means SKILLED. Winning a 1v2+ situation on that caliber of play are gonna be extremely rare.