And so, then you do what? Because that applies equally to the world - people have been having the 'how much is too much?' conversation for a long time. Nobody gas come up with an answer that doesn't involve totalitarianism, fascism, genocide, eugenics, reproductive control. So what's your answer? How do you reduce the surplus population before some law of physics is reached and the world kills us all? You want answers, but you haven't offered any.Why does the "open borders" hypothetical scenario always come up in these discussions?
Well, because (apart from the fact that there are urban75 posters who have at various points in the past said they support the principle in a non hypothetical way) it's a way of trying to get at some idea of whether there is a "reasonable" limit to the amount of immigration that the UK should allow, or not.
Most people are reluctant to say what amount they think is "too much" or how they would try and determine that amount, probably because they will be accused of xenophobia within a microsecond of making such a statement.
The closest we have got on this thread is some kind of constraint based on land area for agriculture.
If someone's reply is that "it's a silly question because whatever that number is, we will never reach it" then it seems natural to ask whether that applies even if there were no borders at all, because that's where you end up at if you progressively increase the numbers, with no point being the point at which you say "ok maybe we are reaching a number which is too high".
That's because otherwise, aren't we basically saying that the number will always be constrained by what the population/electorate/establishment/whatever will tolerate (based partly on xenophobic instincts), so there's not much point considering what the implications of going beyond that would be, whilst simultaneously arguing to persuade the population/electorate/establishment/whatever that we should be allowing substantially more immigration than at present.
If you want to persuade someone sceptical that we should be allowing a lot more immigration than we currently do then you should have some sort of answer to the inevitable question of "how much more". That's a question I always feel unequipped to answer, because most discussions about trying to come up with some number seem to end up getting shut down with accusations of racism and so on.