Countless infections mean countless viral copies—means more of a chance of an escape mutant making a break. The immunity wall is built from the corpses of viral evolution's successes. Evolution, for us, means survival of the fitter pheno-/genotypes who don't end up as bricks in the wall.
COVID is still evolving and will find new ways to evade immune systems, scientists say.

"In fact, SARS-CoV-2 has been evolving the ability to evade the immune system about twice as fast as the fastest-evolving flu virus"

Source: www.npr.org/sections/sho...

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