6 months was the trial study. It may provide protection for 6-12 months or more. mRNA isn't exactly new either...maybe to this level, but it's been around for decades.
I still think everyone should have the right to get it or not, but those who choose "no" are going to have to live with the shut downs and restrictions when you have cases like MI where hospitals are getting overburdened again. It's easy to cry about not being able to dine in to eat a burger or watch a move in a theater when you're not a healthcare worker with sick patients gasping for air piling up in the lobby