There’s a lot to unpack here. Theoretically if you go with Gottlieb approach you need low level npis to protect the vulnerable (and unvaxxed kids) until they can get their boosters. Again that’s just to be logically consistent but policy is messy and not always logical.Why would the existence of a booster shot make lockdowns more likely?
I don’t think you’ll see many more business closures. High vax areas aren’t getting large enough spikes to provoke lockdown discussions. Low vax areas don’t have political support for business closures.
Short of a truly vaccine resistant variant, i would bet businesses stay open.
your position is belied by the fact that Hawaii, despite a high vaccination rate and masks, has hit record case numbers (4x prior peaks) and has imposed already restrictions on bars restaurants and has other measures (such as beach closures on the table)
but I think, at least in the us (and my answer was larger than just the us or SoCal) the answer to your assumption turns on whether newsom is recalled. If he is, I think the blue states might actually be cowed enough to not do business closures during any hypothetical winter waves. If he isn’t and the wave gets bad enough, I think you could see things like school closures, shutting down indoor dining and bars, shutting down gyms and theaters, shutting down large events or putting capacity restrictions again like on Disneyland. Again remember the rule in California: you cannot shut schools if the kids during the shuttered school day can go to Disneyland.