Keiji Inafune, the creator of Dead Rising, left Capcom last year. Granted, he wasn't heavily involved in DR2, with Blue Castle (now Capcom Vancouver) being in Canada, but it seems now he is gone, no one wants to move the series on. The same has happened with Resident Evil and Devil May Cry, with their respective producers leaving Capcom.
Now you bring up Street Fighter, Capcom have made the hilarious mistake of calling the forthcoming balance patch for SSFIV:AE, Super Street Fighter IV: Arcade Edition Version 2012!
"You're giving me Asari Commandos? You're the best father a girl could wish for!" - Liara T'Soni