Frankly, every local authority is in trouble with funding adult social care (a statutory obligation) so they are having to make more cuts to other stuff. Care homes were already closing because they don't make money. 1600 have closed in the last ten years (1 in 8). An arbitrary cut-off at 75 sounds inhuman but if someone has dementia or a chronic painful condition and gets coronavirus...
I've already heard people reminiscing about pneumonia as "old man's friend" (not nice but 100 years ago judged a relatively painless way to go).
It simply isn't always a good thing to prolong life. I have in mind a GP friend who had a stroke and survived but his quality of life was poor and caring for him ruined his wife's health.
Difficult decisions about who gets treated will swiftly become the norm.