You ask how many will want to come and "work in a hostile environment".
What makes you think that Britain is "hostile"? The people you are talking about have been told they are welcome to work and stay here. Britain is not hostile to anybody that is prepared to live among us and be part of our society. You have been brainwashed into believing the Remainers litany of "isolationist" Britain. It is just not true. Do you ever visit America, Canada, Australia, New Zealand and a host of other sovereign nations? You are welcome to visit those places ...but are NOT welcome to simply arrive and demand that you be supported by the locals. You enter for a period to visit, you may not work unless you apply for that status. Britain is no different to them....welcoming and tolerant. It is time that people here regained a measure of pride in their country. People that have pride in what they have always earn the respct of outsiders. Without pride you get no respect and are taken advantage of. So, Britain, please get a backbone and stop wqhining!