Because I think things have been moving along now for so long that some people forget. That is, that D&D Next, under the leadership of Mike Mearls, is still trying very hard to please everyone. Particularly the old-schoolers. If this article turns out to be an accurate depiction of what starting a D&D Next campaign is like, then we're on solid ground.
Because the thing is, Mearls doesn't have to get Old Schoolers to leave OSR games for D&D 5e. That's not what he needs to accomplish. He doesn't have to make something that scratches their old-school itch better than AD&D 1e; that's just not going to happen.
All he does have to do is make a game that an old schooler can look at and say "yes, I could live with playing/running that". Because then, by virtue of the sheer number of people who are saying the same, Next will take up a place in the list of games that may not be his favorite but that he is likely to often play.
Currently Smoking: Ben Wade Rhodesian + Image Latakia