I don't think it's a matter of wanting to "be hip", but a case of recruiting being a huge problem for most companies. Renting out the 'cool' co-working spaces of WeWork probably isn't their long term goal.

If BigCo has exhausted the talent in their city they have three options left: employ remote workers, pay people to relocate, or open satellite offices and pay a little more than then the local businesses to get people. WeWork is enabling the last option at scale. Renting managed office is a viable business model that's been happening for decades.

Whether there's enough of a market to make WeWork work is another question, but there might be. Anecdotally, a large insurer recently opened a new office in my city here in the UK because they've had 40 open positions in their London office for years. They've already filled half those positions. They wouldn't have done that without renting a large office on a business park.