I agree with your thought process. However, there is another rule of thumb that says how much more expensive it is to get a new customer than to retain an old one. What happens if Radisson goes after these "young affluents" (and not so affluents given the two for one pricing and kids free) and that sends a number of their current bread and butter customers off to SilverSea or Seabourn? I trust that Radisson has done their market research and is not just "trying" this out.
It sure would be nice for the Radisson lurker to speak up. ;)
marc