Every year there is indeed a huge increase in hospital admissions and deaths from flu/pneumonia around/after xmas/new year - due to people and their bugs mixing indoors for long periods. We do seem to have accepted this, but perhaps we shouldn't have - a bit like accepting car deaths before seat-belts/speed limits/drink-drive limits - just because we accepted deaths in the past is not a reason to continue to do so.
As to how we address this post Covid - more research into flu vaccines would be a start - their efficacy is pretty limited, despite which huge numbers of doses are given each year, resulting in large profits. Having said that, I have had it every year for over a decade, though I have yet to do so this autumn/winter, as the risk of catching Covid is a GP's surgery or a pharmacy is considerable at the moment.
And even without Covid, maybe we should not hug grannie over xmas if we have a sniffle.