I'm 100% on-board with old and frail people getting vaxxed. Stick that needle in and go nuts. Even if it's the sterilising poison of conspiracy fame, it doesn't matter to them since they're old anyway and they don't want to go to hospital with the coof. But don't bother young people with some bullshit.
Maybe in the next 9 months, once enough boomers have been vaccinated, globohomo governments will simply call it a day. They'll just rip up all the social distancing markers and destroy the massive test-and-trace capacity they've created. Executive governments will simply return their powers to parliaments, which will all consist of honest politicians who will represent their constituents properly. A liberation day will be held. People will be dancing in the streets, burning face masks and the whole period will be like a combination of V-E Day and the Summer of Love. "Cases" will circulate, but governments will say that we need to live with this just like with the flu, and in any case we can't afford to maintain this test/trace/isolate capacity forever.
Of course we all know this scenario is extremely unlikely. But suppose it's true. Suppose our governments have nothing but love and good will towards us, and are working round-the-clock to get us back to the old normal ASAP, even though 100% of their behaviour so far is indicating the complete opposite. What do you then actually lose if you don't immediately cave in to the pressure to get a vaccine you don't need? A few more months in the transitional period where you'll need some mild social distancing in general, and get tested if you want to fly on holiday? Otherwise what's the actual loss proposition if you're young and healthy and you don't take the vaccine under intense social pressure?
In the far more likely scenario that:
1) Vaccines have serious problems not all of which have yet been discovered.
2) Governments will not just "give back freedom" even if 70% of people get vaccinated, which is going to happen anyway in most Western countries looking at the uptake so far.
Then you were smart, you didn't get rushed into doing something that gave you little to no clear benefit, and unlike the people who complied and got fooled, you can at least walk around with your head held high, prepared for whatever else comes next. Whereas those who keep complying for nothing will sink deeper and deeper in the morass.