I feel sorry for new players just starting out in Destiny because they're paying a lot of $$$ (what is it like $60-$80 for $20 worth of relevant game content) for a fraction of the game. They might as well wait for a game sale before even messing with Destiny in Y2. And as others have pointed out there is really not a lot of incentive to play the Y1 content because there's nothing to gain. It was hard enough trying to get a team together sometimes for the raids now its going to be even tougher. I'm sure very few Vet players are going to feel like doing the old raids. I know I don't feel the urge to.
I actually love doing the old raids, they're a fun experience and a great time if you're looking for lots of laughs with 5 of your best friends. We have not laughed harder then tearing through vog at level 40 and 300+ light.