There's really no way around it. Either they release strong single prizers that can catch up somewhat with Rule Box, or evidently just ignore the problem and keep releasing stronger Rule Box everytime.
This is completely how I see it. The only way to make broken cards not broken, short of banning them (which I doubt The Pokemon Company is willing to do), is to release so many "broken" cards that the formerly broken cards aren't broken anymore.
With that being said, I really wish this card was stronger. But I guess it could be worse.