im not a diablo fan
so you sir, are wrong
people will play it, sure they will, but games dont become ghost towns because of it, they didnt when d2 hit, or when sc3 hit, or any other game hit
people really give games way too much credit for doing this
also wasnt rift supposed to make every game a ghost town too? looks like no one seemed to care and were all still playing their usual games when it came out too
point is, game releases, while they may have small impacts, do not truely take users away from other games.