In reality knocking down these high rises will never really happen....even if there another fire tomorrow.
So my first property was a flat, not high rise as such, only 7 floors and built in the mid 1930's. My flat had a share of the freehold which is rare, so by owning it I was invited to the board meetings, for the company that maintained the flats and had a vote on decisions made.
There were about 60 flats in total, at the time (2010-13) only
7 were owner-occupied including mine, the rest were rented. Some were private rented, some often to the council, which sadly let 'interesting' characters stay in them. The maintenance fee was quite high, just under 200 notes a month. (did have 2 small lifts) But only around 70% of the flats were actually paid up, many landlords did not bother paying it.
Cash flow was a real problem for maintaining the building, things had to be saved up for, like new carpet or windows. My building did not have sprinklers, although there were alarms. I'd imagine sprinklers would be a huge, huge job and massively expensive and would only do the corridors?
So something like that would have to go out to flat owners, to stump up say £500 each to get £30k and potential for setup in each flat. The issue is you will never get every flat to pay up, some won't - So the company would then have to get a loan? More costs.... other flats having to pay for others that won't pay. It's all a mess really.
http://www.rightmove.co.uk/property-to-rent/property-59885887.html
Up for rent following right to buy purchase and subsequent refurbishment... yet you accuse the contractors/councils of being greedy 
Anyone paying £1,700 a month to live there wants sectioning...
2 bed flat in Zone 1? That's good value for London. Guy I work with is looking to flat share, their budget is exactly that... so be £850 each. That's standard London costings....
I could have rented my 1 bed flat when I had it, on Zone 2 border in Acton for well over £1.2k a month