Deal with it.
Might as well keep him banned forever, there'll be no way to deal with a fed Zed who constantly dives your AD carry.
Some players such as Bjergsen have said if this change wasn't made with the Zed changes he would have become unplayable in competitive.
I favor what he and others have said however, I would rather have a strong champion with counter play, i.e. what he was before, than a weaker champion with no counter play, what they are changing him to.