Earlier quoted context omitted.
The opposite. California is going to UTC-7 year-round. The East Coast varies between UTC-5 and UTC-4. California is effectively going to be in the exact same time zone as Arizona, which is in Mountain Standard Time and does not recognize DST. Honestly, we should just abolish the Pacific time zone and then abolish DST on the West Coast. Rename Mountain Standard Time to Western Standard Time.
I can't imagine people in the northern reaches of Mountain time would be pleased about never having DST. They'd likely be better off moving to CST (so no DST).
US law allows for states to opt in or out of DST. (Also, Indian reservations, because they're treated as quasi-sovereign nations in some ways.) A WST would probably entail WA, OR, and CA opting out with AZ while MT, ID, WY opt in.