I think OH, IN, AZ, and PA are already Republican gerrymanders and are of course likely to stay that way. Someone please correct me if I am wrong.
There is an off-chance that OH could end up as a compromise if Democrats are able to hold their slim General Assembly majority.
I'm also holding out hope that GOP candidate for Secretary of State will encourage a fair redistricting process. Over the past year he has been working towards bipartisan redistricting reform without much success but I'm hoping his presence on the reapportionment board that draws state legislative districts will be moderating.