It also needs to be mentioned that any change in legislation may affect the ability of British citizens living overseas to return with their foreign-born spouse and families.
Currently, the returning British citizen needs to show they have a guaranteed job offer in the UK, starting within 3 months of arrival, for at least £18,600pa. Failing that, you need savings of at least £62,500.
This sounds like a workable idea in theory, but, in practice, if the British spouse is a SAHP or in low-paid employment then these rules mean it's almost impossible to return to the UK with your family.
The main alternative available is the Surinder Singh route, where you can temporarily settle in another EU country, and then exercise your right to an EEA family permit and relocate to the UK.
I'm sure UKIPpers would paint this as a sneaky back-door way of getting in, which should absolutely be slammed shut - but its loss will be a huge blow to any British citizen abroad who is a SAHP or in low-paid employment and needs to return with their spouse and family.