I personally (and without any empirical evidence) think that there is no way London needs this much more office space, partly because "Brexit China Tariffs", but mostly because remote working and "just not in the office five days a week" is becoming a thing.
Turning that sterile office space onto more live/work/mix-it-up space, perhaps floors 1-20 as office and 20-40 as apartments or something, will almaot certainly be a feature of the next twenty years.
And all that office space and living space and mixed something or other we don't quite get, all that will need to be sold and packaged and marketed.
And so, long story long, whilst WeWork may look like a joke, may be a "lose money on each sale but make it up in volume", something like WeWork may just be the Hoover or the Pullman coach of mixed live work office buildings. Because mixed live work office buildings will be the Pullman coaches of tomorrow's cities - cities have a new brighter car free future, where Barcelona's mega-blocks will meets the density of skyscrapers. But it needs ... looking after.
Putting a millions tons of glass and steel pointing straight up is an awesome technical achievement
Making that tower somewhere that families can live, love, shop and work is a different skill set entirely.
It won't look like building service companies do today. It might just look like WeWork
(Thank you, normal cynical and cutting remarks will resume shortly)