Surely the Republican controlled legislature won't let this drop. There probably will be some sort of action taken to correct this.
Not if Wolf's veto pen has anything to say about it. If Republicans pick PA-GOV back up in 2018, you are probably right, though.
I don't think a constitutional amendment requires the gov's signature. As I understand it, an amendment can be approved by a majority of both chambers in two consecutive assemblies then sent to the voters directly. An independent or bipartisan redistricting amendment could emerge that way.