You make it sound as if immune evasion is a binary thing. It's a spectrum. We don't need to worry about 100% evasion suddenly appearing and it's definitely not

You make it sound as if immune evasion is a binary thing. It's a spectrum. We don't need to worry about 100% evasion suddenly appearing and it's definitely not what we are seeing with B.1.351 and P.1. There are somewhat lower antibody titers with current vaccines, but they are still very effective both in antibody and T-Cell response it seems. "Proof" from Manaus would have to be replicated in lab settings and all the data from lab tests show that there is some slight immune escape for P.1, but by no means is it total.