The immune system already does that and its the responsibility of CD4+ helper T-cells. The 2009 pandemic was significantly blunted because people born before 1

The immune system already does that and its the responsibility of CD4+ helper T-cells. The 2009 pandemic was significantly blunted because people born before 1957 had partial immunity from cross-reactive T-cells to H1N1 which was endemic in humans from 1918-1957. So after mutating in probably billions of pigs for 50 years the H1N1 virus that hopped back to humans was still sufficiently recognized by the immune system of older people to take any edge off of that pandemic. I'm also fairly skeptical of the data coming out of Israel about waning immunity. Everyone is taking that data at face value while entirely ignoring the disclaimer: "(Potential confounders include the fact that the very oldest Israelis, with the weakest immune systems, were vaccinated first.)". We really need a lot better data on much better matched cohorts to determine actual immune waning in the presence of the same viral variant.