I think BikeSnobNYC hit the nail on the head with his theory of the "Retrogrouch Breaking Point" -- that each person finds for themselves the point at which newer technology doesn't impress them enough to use. Cog count is a great example, because as the percentage of change keeps going down (from 5 to 6 cogs was a 20% increase -- very handy; 10 to 11 was only 10% -- hmm, did it shift or not?) you'll see more people coming out of the woodwork to question whether it's worth it. But as long as the stuff works, there won't be much real pushback.