The thing is, that things aren't as simple as a transition of magazines from print to online. I think a lot of the functions magazines used to serve have been superceeded by things like...well, ENWorld itself. News, discussion, & connection to community. It's different. Better in some ways. Worse in some ways. Definately different in organization & operation.
& it's not just the web. Cable & satellite TV today can fill some of the roles magazines used to. Even console games.
Traditionally, most magazines made the bulk of their money off of ads rather than subscriptions, which kind of messes with the magazine subscription v. website subscription thing a bit too.