influenza mutates much faster than the covid family [1] - looking at the other coronavirus family there is plenty of reason to have expectations that this will become an endemic mild seasonal cold. The most similar coronaviruses provide life long immunity (please don't mistake immunity as being unable to experience symptoms, just means bad clinical outcomes will likely plummet due to immune system recognition) [2]

[1] https://hub.jhu.edu/2020/06/10/sars-cov-2-dna-suggests-singl... [2]https://www.biorxiv.org/content/10.1101/2020.12.17.423313v1....