Widow I don't think anybody who might vote to leave the EU would countenance residency being denied retroactively - I certainly wouldn't, even though I am leaning towards voting for us to leave the EU. These are things that need to be hammered out and made very clear before any referendum, and I should hope the government will make the position clear. If they are planning to impose this, then on those grounds alone I would vote for us to stay in even though I don't think it's in the UK's best interests.
Re. Commonwealth citizens being allowed to vote in UK elections, that's a bloody farce. Can you imagine if they attempted to argue that for a chance to vote in Australian elections for example? They'd get very short shrift. It is unfair.
When I was younger, and very pro-Europe, I thought membership of the EU would do all these marvellous things for the UK. That simply hasn't happened, and there is a very large part of the population who are growing increasingly frustrated at seeing their sovereignty being whittled away day-by-day. They cannot, and will not be ignored. The UK has never been culturally 'European'. We are not generally inclined towards the more staunchly socialist political culture that is so entrenched in Scandinavia and France, and while we're not as rapaciously capitalist as the USA, we aren't a comfy fit with mainland Europe. Thank God we never joined the Euro, as we would never have been able to grow our way out of the recession, which we have done slowly but surely.
If the SNP victory has taught us anything, it's that people do have a profound sense of their own culture and will fight hard to be heard. I see the EU referendum as akin to that.