I agree with the PM on this one. You have to remember the PM is from London. Anyone outside of London will struggle to find the logic in what he is saying because the philosophy of increased housing mobility is only attractive to people with jet-set London lifestyles. In London, things move very quickly, because of the raised level of alertness in human beings who are engaged more in earning an extra ‘bob or two’ to survive the rat race within London. This need to survive, almost acts as a catalyst to the rate of human activity, which also helps to increase the acceptability of housing mobility too, as a consequence. Anyone living in London, who is constantly looking for the next 'raise' in income, will find the idea of moving home very attractive, whereas the remaining population (a vast majority), will find the idea repulsive, because it would mean forsaking their friends and families, for money(!).
So on the basis of the above argument one could easily conclude that increased housing mobility is significantly attractive to 'Capitalists'.
And yes, I am a capitalist too.