Like what experience wouldn't be possible to replicate on the PS3? You mean Wii-mote, right? First of all you can download a Wii-mote driver for the PS3 under Linux, thus a similar controller is technically possible on the PS3. Some devs see more potential in motion capture however:
"Tim Sweeney, CEO of Epic Games and the man behind the Unreal, talked about the future of gaming in an interview and the subject of the Wii controls came up.
Speaking to TG Daily, he explained that the there needs to be a determination made between what is a fundamental change in gaming, and what is a gimmick. Sadly, he thinks that the Wiimote falls into the latter category.
"I still think that motion controllers, such as the Wii controller, have a limited purpose, sort of a gimmicky thing," he said.
"Standing there and holding a bunch of devices and moving them around wildly is great for party games, but I don't think that will fundamentally change the way people interact with computers," Sweeney opined.
He's more of a believer in the PS3 Eye school of motion sensing than having to hold a physical object or two.
"To me, it's more compelling to just use free-form movement and have computers recognize your gestures," he added."
http://www.nintendorevolution.ca/03132008/22/sweeney_dismisses_nintendo_wii_controls_as_gimmicky