Of all the games that have been released over the last 3 years of my EVE Online career, different people with different tastes in games have been pulled away for various amounts of time. But I've never really been distracted by anything else, at least not for long. The most notable were probably WoW: Cataclysm for a couple of weeks (because my friends were still there) and Metal Gear Solid 4 for another couple of weeks.
Diablo 3 will probably be the game that changes that. I say that from experience; Diablo 2 consumed a ridiculous amount of my free time back in the day. So I anticipate D3 doing exactly the same unless Blizzard just somehow really screws it up badly. But from my brief hands-on back during BlizzCon 2008, I have high hopes that will not be the case. (Technically, many brief hands-on; I kept getting back in line when my time was up, hehe.) It was a full 3 years ago, but even then what little bit existed was already impressive.
I has a sadface, though, due to the absence of the Amazon class in D3. Few experiences in my gaming life compared to D2 when I finally got myself a Windforce Bow and unleashed that sucker upon the armies of Hell.
"The first mistake most gameplay zealots make is thinking that the game should revolve around them. The second is believing that it already does."
"Maybe it's just a game. Or perhaps it's a world. Perhaps it's a community. One thing is for certain: If it's only a game to you, then that is all it will ever be."