it doesn't.
Anyway, I feel for your concern, because I've had it myself with previous changes.
However, the question you should ask is not how much difference the changes will produce between divisions: in my view, you should ask how quickly can that difference be evened out once you promote?
The answer, up to now, was "relatively quickly if you play your cards correctly". It is possible that the BB will have to increase the promotion prize if the gap between divisions widens. That's the thing to lobby for if the changes achieve their desired result.
The thrust of these changes (and the reason I approve of them) is not to reward division I teams as such (which, as I emphasized, they do not necessarily do). It is rather to enforce two of the guiding principles of BB:
1) that promotion must always be a reward (it was getting to the point that a life of victories in Div. II was better long term and short term than a life of mediocrity in Div. I).
2) that there should not be farm teams.