Ultimately, for control of many of these issues, a localist approach is superior..understand the local culture, etc.
Maybe a coworkery in La Jolla would have surfboard racks and a tacit understanding that surfing comes first...so allowance for wet gears (and showers) might be needed. Maybe a location in Boulder has community climbing gear and/or a bouldering wall.
So, does scale lend _any_ benefit? Certainly the "network" of locations might help...but what % of tenants are really and truely jet-setters off to many major cities, versus those that stay close to home and just need a regular space out of the house. I don't think scale is that vital in this view.
Next, deals...I suppose scale can lend itself to leasing deals with major brokers that have multi-city inventory. But that benefit is only on the supply side, and unless the _same_ landlord is involved, they won't come down in price just because.
At the end of the day, more, 'localist' coworking spaces probably wins and is a more dynamic market (and thus resilient) than some attempt at "winner-take-all" scale. Also, to reinforce that...I suspect many times a good coworking location is probably an individuals labor of love...they like their town, had access to the commercial space, and they wanted it first-and-foremost for themselves. Any subscribers are just helping to pay the bills and making new friends.