I don't think this is necessary, at least for modern ranked. Reason is I think we've established that next season, Chaos Legion will be unusable then Rebellion + new set will be the usable ones in next pack season. So, everytime a new pack is released, the previous strategies will be unusable. As an example, since Scarred Llama Mage and Kron the Undying will not be available starting Dec 5, then people needs to make new strategies for that 17 mana sweet spot.

This, is still a problem in Wild though. The ban system may only be applied in Wild but that also will decrease the price of the said banned cards.

In the question of "who will do this?"
We have the community proposal. So, just have a survey or suggestion of what card you think should be banned. Majority should know what cards are overpowered. Or maybe take the opinions of those in the higher divisions.