I agree, the state legislatures should still be picking the senators.
Regarding our original Founders, my dear (WWII vet) dad always that the only thing they missed the mark on was in not putting term limits on our legislators!
And IMO, he’s right.
CA Assembly members are limited to six years in office, 3 terms, and Senators to eight years in office, 2 terms. After that they are banned from that chamber for life.
Fourteen years in state legislative office seems like ample time but there are those who argue there's a problem with "institutional memory" in the CA legislature. I haven't read up on recent analyses but know they've been done.