The game itself doesnt leave pvp as it is and pro did the same till now.
The idea isn't that bad but it's hard to make a totally fair change to improve the pvp without having side-effects.
It's not about not being able to counterattack certain teams or pokes, i guess it's about making it more interesting by changing a little bit the meta every once in a while.
Again it's +1 for me if the banned poke are 1-3 and they get a ban timer so they won't be banned every 2 months.