Or perhaps the present. I rented X-Men Legends 2: Rise of the Apocolypse this week, and it can show really where Diablo 3 can go. For those who haven't played it, you play a team of four, from thirteen possible characters. Levelling, skill points, stat points and items are very similar to D2 (with the exception of socketing and runewords). Either way, it is in the same vein as Diablo for those who are looking for a game to play.
Its really the same game, if you have played it: Waypoints, five acts, etc. The idea of controlling four characters at once is a good idea for future games. The plot is very similar to Diablo (you can re-run areas, there are three difficulty levels etc.) And X-Men Legends 2 is based on the comic books not the movie.