I can’t see the powers that be in CA allowing this. Yes, more Senator’s but the only reason a Dem has a shot at the presidency is due to the automatic 55 electoral college votes from CA. They get almost 1/5 of the needed votes without even trying. This would break things up enough so that they’d have to at least fight for all of those EC votes - moving funds away from other battlegrounds. It would only take a part of them to vote Republican to make it virtually impossible to have a Dem POTUS.
Right, California Dems might like the idea of having more senators, but any breakup of the 55 Electoral votes that automatically go Democrat every cycle would basically destroy any chance of a Democrat president for the foreseeable future. I can’t see Sacramento agreeing to that.