Sales are not going to drop if the enthusiast species ceases to exist. That's just sensationalism. The overclocker/extreme benchers will still buy highest end hardware even if its non socketed to go about their benching. Realistically how often do people upgrade? 2-3 years? Intel changes or forces the buyer to change mobos anyway so this is really not going to change anything on that front.
But this does force you to make a purchase choice on a combo rather than independent CPU and motherboard choices at time of purchase. Intel knows the market well, tech savvy people who read websites like this are not on their minds or their major revenue generators. You have to wake up to the market reality that we are just not that important.
They have understood how the vast majority of the people will think for months to buy a car but would buy a very costly smartphone in a heartbeat as if its some daily use cosmetic. Its now fashionable to buy and change phones like its some sort of use and throw item. Trade in programs by many telcos are a reflection of that. Use that logic and they can force the buyer to make a quick choice now Combo 1, Combo 2 or Combo 3 etc no more mix-matches now. It maybe hard for people like us to imagine it but this means lesser complex choices to make, its a simple matter of combos. We on the other hand like lots of permutations in these choices, that's just us not the average joe.
This move, should it happen, will make buyer choice simpler and serve Intel's refined engineering options moving forwards. Many companies will go down this route.
The market will dictate it not the egos of a few enthusiasts.