>1) Difficult/unpredictable/uncontrollable customer retention

I don't think this is the case in a lot of WeWorks anymore, i work in a WeWork and the majority of companies are now bigger corporates.

Goldman Sachs just took 2 floors in the WeWork next to us.

It's actually quite hard to find a largeish Co-Working space in London as it moves so quickly and so much space is being taken by corporates buying entire floors.