It was a big mistake for the court to rule as it did with Reynolds back in the 1960's. The Senate is not designed to be OMOV and applying a different standard to the State Senate's on the basis of the 14th Amendment only serves to create a contradiction between Article 1 and the 14th amendment.
Illinois would be much better if it had a State Senate by county. As it is now the South and Central parts of the state's can litterally get crapped on and that will increasingly be the case now that Southern ILL is just as Republican as Central ILL and thus Democrats have no incentive to appeal to that region. Everett Dirksen warned about this back then regarding Illinois.
So... permanent Republican supermajorities in about 40 states' Senates? Cute fantasy! Where did I ever mention such should be extended to the lower house in those state's? I said the exact opposite just a few posts ago. The big states would have a split legislature forcing compromise and better policy outcomes and ending partisan gerrymandering. Where did
I mention anything about extending it to the lower houses?! Once again, your proposal would ensure permanent Republican majorities in most states' upper houses. The unfortunate citizens of these states would flip back and forth between either total GOP control of both houses
or split control between both parties. I know that would be a GOP hack's wet dream, but for the rest of us it would be utterly appalling and completely ludicrous.