Eventually, as buildings fall into decline and crime, public health and safety issues arise, the local authorities move in, bulldoze the place and sell off the land for redevelopment into offices and trendy wine bars. The phoenix rises from the ashes, forty years of neglect are wiped clean. And nobody lives there any more.
The selling off of high value property in Chelsea to fund social housing elsewhere, as Grant Shapps is proposing, sounds to me like the opposite of urban blight. If I had the means to buy a house in an exclusive borough it would not best please me to find an extended family of Somalian refugees living next door. And as a normal tax payer I am offended by the notion that those who contribute nothing may get to live in a house I could only ever dream of.
Those on the left have attacked the proposal as social cleansing. But let's call a spade a spade, eh? This would be so much more far-reaching than mere cleansing. This would be Chelsea wiping its arse.