The Grove on Fillmore St in SF has a goodbye to wifi sign near the entrance that I just noticed a couple of weeks ago, which I thought was pretty interesting. I, personally don't mind the wifi'ers at Starbucks or Panera, but my main comment is that the seating plans of these shops are not setup for solo workers. One visit to Starbucks had a slew of wifi workers sitting at 2-person tables. I couldn't help but think that the shop was a 1/2 occupancy just due to the seating plan.

It's definitely an interesting problem. Everyone has laptops, and coffee shops seemingly are not hurting for patrons anymore.