I doubt a lot of people remember it but there was a system in place in the original BF though it only got to implement a couple of changes.
It was a sort of "player council" that would discuss balance changes with the developers following certain steps:
1. Cards would be submitted to balance changes by community vote
2. If the devs agreed that the card could use a change (based on the Database: Number of places \ Win Rate etc.) the "council" would be asked to submit arguments for certain changes in a secluded part of the Forum
3. The Devs would collect theese changes and propose a certain change wich would be disscused in a Live Chat with the "council"
That only happend about 4 Times in the time where i was on it. The major Problem was that the changes came to slow and that there was no way to reimburse players who spend a lot of BFP on a card only to have it nerved. The Devs were quite carefull with changes due to that fact.
Overall i belive it would be a solid system if u introduce a regularity and now that the game is free to play
And since my forum account has a different name (some1 took my old one) this is Feagul