I would love to know which groups of society can afford rent of £2000+ a month without any kind of handout! Certainly not Mr & Mrs Average, that's for sure. Impatient - you seem to be seriously suggesting that social cleansing of London is acceptable!
Once again, people are just choosing to ignore so many aspects of this. So people seemed to be moaning - consider that they might be seriously depressed, unable to see the wood for the trees, been kicked so many times they can't get up again, desperately trying to find a reason - any reason - that might mean they can stay in their home city? Plus some of these people have only ever lived in London since coming to this country, with a limited social circle and limited opportunities. Why presume that they realised that they were being screwed over for years?
Absolutely yes, private rents should be capped to protect people from exploitation. Anyone who chooses to pay £2,000 a month in rent needs their head examining, so I have to presume that anyone in that position is there because they have no viable alternative.
Yes the welfare state has allowed this situation to happen, but there is no defensible reason for suddenly changing the rules to the detriment of individual families who have made their choices in good faith.