Miaghstir: Inspired by this thread, I decided to send Blizzard a nice e-mail asking them to make their older games available again, at least the ones they don't already sell from their own store (suggesting GOG as a channel, of course). I doubt I'll hear anything back, but for each person that tells them we want the games, there's a slightly higher chance they might consider it.
They usually answer the support tickets in a few hours (faster if it is about a hacked account). But that is for their support section, I tried asking there a few times, and always got a similar answer (working on more important games, not in our plans...).
Btw, what email address did you use? Maybe they have some 'business' address that users can email to, that probably goes directly to those in charge?
(Also, probably the best way to get a result is to talk with the those in charge during BlizzCon. Contacting their community managers may work too.)