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Assuming something doesn't happen that will lead them to hark back to the old day where the UK was mostly white and furrin's knew their place (it is mostly the older generation that is anti international in most countries, so probably not too likely) and since there are no fond memory anyway where of being able to buy a 3 bedroom house on 1 salary and other "but the old days..." I'd say there is a chance of a rejoin or at least a good boot up the hole to the Cons.
I doubt they'll forget about the lies and BS too, now if Brexit becomes a super success then it is different but so far both practicalities (not wanting to compromise and losing a lot of service access to the EU and with that lots of £ and jobs) and values (international UK but blaming other countries and furrin's) don't make me think it will be.
20 years though and the work starts now and no guarantee we get a border poll either here in Norn Eire :/
In 20 years though, I'll be a 47 year old banging on about when the UK was great and part of the union. Will the new younger generation have the same view?