They wanted to introduce the cross world PF way back when. This has nothing to do with anyone quitting the game. In fact, from my personal experience, there's more players since 3.0 than there have been back in all of 2.x. So I don't really see where this "too many people are quitting" comes from. Try getting onto Balmung. It's always full. Back in 2.x you had 100% windows of getting in. Now? Fat chance.