I mentioned this a few days ago in the South Carolina redistricting topic. I don't think Thomas is the only Justice to believe that this line of jurisprudence should be overturned. He definitely has Alito and probably Gorsuch. Gorsuch tends not to tip his hand too often, but his vote in
Moore doesn't give me much hope for him.
I could be wrong, but I think this is the first time Justice Thomas has explicitly called for overturning the line of cases that started with
Baker. He had the opportunity in
Rucho, but that case had no concurrences (it was straight-up Roberts versus Kagan). I wonder if he's giving signals to the lower courts to try to push these issues to the top.
FWIW the original equal population congressional districts case Wesberry v. Sanders was decidedly closer (6/3) than Reynolds v. Sims, the equal population state legislative districts case (8/1) for reasons I don't entirely understand. They were both decided the same year by the same 9 justices.
Reynolds v. Sims was based on the Equal Protection Clause of the 14th Amendment. Written by originalist Justice Hugo Black,
Wesberry v. Sanders was based on an originalist reading of Article I, Section 2.
Wesberry had no reliance on the 14th Amendment or any other amendment.