We know that if we stay employment laws will remain in force. If we leave, we do not know that. And no, there won't be riots on the street if Boris does away with the Working Time Directive and maternity rights but a lot of people will be very miserable.
We know that if we stay, we have the right to holiday, work and study in another EU country. It seems unlikely that the EU would really punish us by introducing visa requirements, but it is an unknown.
We can surmise that there will be economic upheaval in the short-term. How long is "short-term"? No idea. If we stay, things will settle down.
Immigration is not the issue. Not planning for immigration is the issue. Our government needs to sort itself out, invest in services and get more houses built. Pronto. And keep nagging the EU to allow member states more control over immigration. If we leave, there are no guarantees immigration will stop but we may get more illegal immigration because it won't be in France's interests to prevent them coming over from Calais.
Can anyone tell me why withdrawing into isolation is a good thing? It's all very well to say we can look to the rest of the world, but if you take the narrow example of holidays it's much cheaper to holiday in Europe than it is outside Europe. And we don't all want to go to Cornwall as an alternative.
As for other countries joining we have an absolute veto on new members. Turkey cannot join without our say-so. But if we leave, it can. And that means lots of people from a poorer country able to get as far as France (or Ireland). And if we become the tiger economy the Brexiters want us to believe we will, they'll cross the border to NI and stay here. We have more control over EU immigration inside the EU than we do outside.
I suspect I can't persuade people reading this if you are a commited Brexiter. But I firmly believe that if we leave, my son's life chances will be very adversely affected. I do not want that to happen.