[Big Mike]

As Ed Miller put it in his book Getting Started in NLHE: "No Limit is a flawed game; limit is far more robust".

The very nature of no limit poker makes it possible to negate any skill disadvantage one might have. You may have read about Sklansky teaching some guy's daughter a simple system (based on going all in preflop) that allowed her to cash in her first tourney.
It isn't really that the game has become less skillful, just that different skills are now being emphasized. Knowing preflop percentages and odds, and being able to judge your hand's equity versus the opponents range is probably becoming as important as making a good read and playing the flop and turn.

As others have said, as the audience becomes more educated, the HORSE tourney will become the premier event.