Cinq said in a recent interview that they are looking into how Another Code/Trace Memory as well as Hotel Dusk could come onto the Wii (I think something along the lines of Trauma Center Second Opinion). To me, they'd have to make it substancially longer (especially Trace Memory, which is two sitting game if you really burn through it).
These two games are definately two of my absolute favorites for the DS. As much as I'd love to see a third game with a new storyline and new characters, I agree with others that a prequel to Hotel Dusk would make a lot of sense. Here's a crazy thought... Have it starring Bradley. Yeah, if you finished Hotel Dusk, I think you might be able to see how seeing his story unfolding would be great, and plus a lot of the characters from the first game could come back pretty seamlessly.