I'm going to hang onto my slim PS3. It's still one of the best Blu-Ray players you can buy, and it's the only Blu-Ray player I own, so replacing it will cost me money. Also, Sony does have a few exclusives I already own and want to play in the future. I own a Roku, and a Vizio Co-Star (Google TV), and it is far and away the best Media streaming device I own.
It's just not worth $300 for what I would have to give up.