It never had that much value, it just made it look like it did for long enough to get people to invest in it at vastly inflated prices. "Renting offices to work in" was never going to be a silicon valley style success, because it just can't scale that way.
Explain why. It’s literally Uber for offices. It could’ve worked if managed right.
Is it Uber for offices? Uber's model is that individual people with cars and spare time effectively loan out that car and their time to people wishing to make journeys, with the two parties being connected and the deal arranged by Uber, who take a cut. All the vehicle ownership risk was shoved onto the driver, and in the event that there was suddenly zero demand somewhere, that risk also was borne by the driver (at least, until various jurisdictions started enforcing minimum wage so that drivers who had no rides all day still got paid).
WeWork's model didn't appear to involve individual people with spare office capacity loaning it out for short periods to other people needing an office for a short while. WeWork's model appeared to be that WeWork itself leased office space, and rented it out to people. WeWork paid for the lease, and took on all the risk of that and all the risk of the demand vanishing.