The hard fact is that enough people can, if only judging by how over-subscribed many of these amenities are. Whether or not this is sustainable remains to be seen - I certainly have bones to pick with the IMHO unwise government policy decisions that are pricing essential service workers out of the area - London can not function on bankers, lawyers and techies alone.

There are a fair few free amenities in London - museums, art galleries, concerts sometimes. The parks and gardens are good too.