Because I recall many voices saying that masking would never end, lockdowns would go on forever, and other very dramatic things, all as supposed proof that some shadowy figures were trying to "control" us. Yet, as conditions changed, those policies changed, and control was demonstrable and undeniably loosened (to the dismay of those shadowy figures, I'm sure).
If you peg it to # of cases rather than how many people have antibodies (FROM ANY SOURCE, given the links I provided as evidence on the efficacy of antibodies from past infection)...you can arbitrarily keep delaying the lockdowns and finding new justifications for more and more invasive processes.
No, no more six months. Based on what the scientists were saying for the entire last year about antibodies for 60 to 70 percent of the population resulting in endemic covid, Victoria and the broader USA have exceeded that. I haven't looked into western European countries yet to see what their antibody counts are estimated to be, but if they have similar antibody levels (from vaccination OR past infection), then these mandates should be dismissed immediately.