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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 :/
Perhaps the damage won't be forever, and in 20 years when the younger generations outnumber the minority of "but the old days" and "them furrin's" and "remember when the UK was great?" will be able to move the UK back towards the open liberal society it says it is.
It is not a given, this has galvanized a lot of people that normally don't care about politics though.
In the meantime it is pretty grim, but this post colonial hangup seems to be something a lot of countries went through, and now it is the UK that has to deal with it...and I still go through bouts of sadness walking around Belfast thinking NI really doesn't deserve more misery.
A border poll here is also at least 20 years off.
In the meantime, tell people about settled status, if you have no time to volunteer at least give money to causes and homeless people, join a political party if you feel like it and so on.