Does no one understand the Constitution anymore? For this to happen, the state legislature must approve it (the people can vote all they want, it means nothing). Then Congress has to agree to it also. Without all that, it will never happen. And I have absolutely no doubt that Congress won’t agree to giving California 6 times as many senators as it now has.
New States may be admitted by the Congress into this Union; but no new States shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress.