There seems to me to be a certain amount of illogical thinking involved here. If the author of this article belonged to a group functioning before, and presumably, outside the internet, then this group would be for all intensive purposes invisible to internet users, and therefore unaffected. So does he feel that the entire general area of bdsm should conform to his personal opinions? It seems hard to believe that any stable, closed group would change radically unless the members wanted that change, and welcomed new members.
Personally, i bless the internet every day- i spent many years thinking that what i felt and wanted was aberant/impossible to achieve/fantasy, and would probably never have managed to attain the lifestyle i have today without it. So this to me seems to more than compensate for the negative side, which obviously does exist.