Personally, I am all for this. I have a few favourite (used to be favourite) coffee shops where I can no longer get a seat as too many individuals are writing their Auto Biographies, Opus's, next novel, doing their facebook things, maybe even checking out perb.cc and so on - sitting there with an empty coffee cup for f-g hours. Maybe the folks running these places are too kind but as far as I am concerned, they are fooling themselves that having these wifi freeloaders sitting there for hours is good business.
Am now looking for a new place serving fine coffee that has NO free internet.