I'd imagine not too long after safe and effective vaccines are authorized for children under 12. At that point the majority of those who actively want protection will be able to get it. This is not the same as saying _all_ who want protection will get it, since no vaccine is 100% effective, and some people who would like to be vaccinated will not be able to because of health conditions or other circumstances, but I suspect society as a whole will decide "close enough."

I'm not saying I necessarily agree with that -- I think the number of "people who want protection but can't get it" will be uncomfortably large -- but this is my guess of when society as a whole will decide to move on.

Honestly, I think this means the future looks like the present, but more so. The places that will be hit the hardest will be more working class and in places that under invest in health and welfare. That's already the current trend, certainly in the US -- look at where medicaid expansion following the ACA has and hasn't happened, for instance, and who has access to decent health care and who doesn't. In some ways I think we're lurching back to previous centuries, where diseases like cholera, dysentry, typhus, etc were endemic, and could certainly affect the wealthy and professional classes, but were primarily scourges of the working class.