Thinking a bit about it, I believe the only way they can:

1) Solve the enmity problem;

2) Make the current melded access not relevant anymore;

Would do tanks damage increases based on VIT and not STR. Thus, everybody would drop melded VIT / STR acc and you always generate maximum enimty possible even using Full VIT.

This means that they will not reduce the contribution of the tanks in the raid DPS and its good, but boss will hit harder to compensate.

This is my conclusion on the matter for now, and however the game becomes more linear for tanks, is a good solution to the problem IMO.