It depends how you define casual.
I can think of at least 4 kinds.
1. Those interested in Blu-Ray mostly, but who may pick up a game or two. For these guys it's already enough.
2. A second group of casuals is the "i just don't buy a lot of games" casual, those will just come with time as the price lowers. If you buy less software, the hardware is generally going to need to be cheaoper for you to adopt.
3. Sports casuals, the guys who only buy sports games. In Europe, just being a playstation console seems to be enough to get most guys on bored. In the US this seems nearly impossible for the PS3 to catch back up to. 360 seems like THE madden console and I don't see that changing as "proffesional" and "hardcore" Madden gaming center around the 360. (See Madden Nation on ESPN.)
4. New Causals, The ones who have just recently bought a Wii because it's new, interesting and different. Once again another group that's going to be hard to reach, even new products are going to go unnoticed by this group and they aren't used to throwing down lots of money for consoles as it is.
