>We are already seeing this in action--while natural immunity provides very good protection against reinfection with that strain it doesn't do so well against other strains.

Please post some proof to corroborate any of this. I assume you’re talking about COVID strains here?

>Natural immunity isn’t going to happen, we have seen far too many cases of reinfection with different variants.

Again, source desperately needed here. I’m more than willing to change my take but only with hard data, not sweeping generalizations based on a misunderstanding of how natural immunity works.