Powershift suggestion

Dear Blizzard:

Please consider my suggestion for a change to powershifting.

Shifting forms removes all roots/slows. Each cast of shift into cat,bear,travel form apply an undispellable debuff. This debuff increases the mana cost of shifting into cat,bear,travel form by 50%, stacks 3 times, and lasts 7 seconds. (each application of the debuff would renew the duration).

For the trolls: the 50%, and the numbers 3 and 7 were mostly chosen arbitrarily. I assume if Blizzard would actually try this out, those would not be the final numbers.

Why I like this change more than the current change:
It maintains a core concept of the druid class - extremely high mobility
It provides a cost mechanism for what is essentially a spam dispel. (spamming dispel on any other class will oom you by quite a lot, on top of the down time where you aren't healing/dpsing)

This makes sense because in the past druid shifting forms used to cost a lot. But we dont want the occasional shift to be extremely expensive, just the powershifting.
guess I should have titled this 'feral is OP LOLOLOLOL' to get more attention