I mean, Groupon's still around too, but at ~10% of their IPO valuation. Is it possible WeWork will struggle along? Sure, although I have questions about what will happen with the $6bn of debt they declare in their S1.

But supposing they do, I see little reason to think they'll be a major player. I don't see anything stopping other rental companies from matching any innovations they've made. The same goes for major property owners. Some will stick with big chunks of space. But if there's a 30% premium for being flexible, providing desks, etc, the some of them will happily cut out the middleman.