I guess no one actually will have a definite answer but...
Suppose we dont have a vaccine and covid is "just" another virus that circulates in the community as a long term thing, would it always be the case for years, that you have to isolate for 14 days if someone in your household has it, or you've been in close contact with someone who has it...?
In "normal" times, most winters there are various outbreaks of norovirus, sometimes half my DC class seem to be off with it.....but there is no requirement for anyone except the sufferer to isolate...until 48 hours after symptoms have gone (With young children often a parent would by default as they couldnt be left in their own)
I hope that things will "go back to normal" at some stage,(maybe in the next year?) eg concerts, sports events, being able to have large parties/weddings etc.....but if cv19 is still around in say 5 years, could you have the case that everyone attending a wedding, for example, had to isolate if the mother of the bride was found to have a positive covid test a few days afterwards?
Or if one of your work colleagues tested positive would the workplace have to close....?
Surely a lot of people wouldnt be able to afford to do that?