About half of the guys in my current group read my magazines. They aren't interested in buying- usually because of costs- but like the 'zine & my collection of it goes back to #44, so they have a lot to browse.
The other half are not interested in it at all- they simply don't like the mags. The only time they use material out of them is when their DM is using it.
Thus, when I stop getting my print version, WotC won't get me as a subscriber because I don't like digital periodicals, about 5 other readers will be lost (unless they can scrounge the dough for an online sub of their own), and its probable that they won't gain any new readers from the rest of the group.