Let's be realistic. It's not gonna happen. Kennedy's gonna vote with Thomas and Alito, and gerrymandering is gonna be legal forever.
In
Vieth he only sort of voted with them. He concurred in the judgment but not in overturning
Baker v. Carr, and specifically said that he'd consider claims that partisan gerrymandering has gone too far if someone can actually find a decent metric for it.
That, essentially, is what's now happened with
Gill. People have worked since
Vieth to come up with such a measure, and now they think they've got one that will satisfy Kennedy.
As I saw
Vieth described: Four conservative justices said that gerrymandering is great! Four liberal justices said that gerrymandering sucks! And Kennedy threw up his hands and said, "I'm confused! Some smart person help me!"
EDIT:
http://www.cbc.ca/news/world/us-supreme-court-hearings-1.4319631Apparently, what might happen in the gerrymandering case is that Kennedy will say, "Well... I agree with the complainants... but they don't have standing."