Callistemon21
Germanshepherdsmum
Most married students are postgrads on shorter courses I believe.
And surely, on a three year course, they might manage a trip home in the long summer vacation.
Many of the students who will be affected are slightly older females from countries in the Middle East and Africa. Until relatively recently, very few of these students studied abroad. Many of them marry young, but the world is changing and some of them are allowed to carry on with their careers.
Some of them come to the UK to study, but they have to bring their families with them. They then usually return to their country of origin. Competition for these students is fierce. If it's too difficult to come to the UK, they'll probably go to the US or (if they speak English) Australia, Canada or New Zealand.
My partner spent two years in California after graduating. He took his wife with him and one of his children was born in the US. It's common practice.
I actually wonder how many students will be affected - presumably only those doing non-research masters courses. As mentioned earlier, many universities are now phasing some of these courses out and offering research-based MRes courses instead. Presumably students will be able to bring in family members if they're doing an MRes.