Back in my Day you just needed the other person's Phone Number.
You just brought back a flood of memories playing Diablo 1 & Warcraft 2 online, having to play late at night so my using the phone line wouldn't piss off my parents.
This doesn't affect me personally, but this is one of the consequences of having games that hinge on the online services to offer the full experience. Reminds me of Demon's Souls, and how they've planned to shut down their servers several times, only for the rabid fanbase of the game to pitch a fit until they relented.
I wonder how long they'll support the Wii virtual console service...there are a LOT of games I've been meaning to download/try off of there, and i'd hate to see them evaporate from thin air and being left with Wii U's paltry offerings.