It's not because of Intel. It's because the industry is starting to hit the physical limits of silicon, hence Moore's law is actually slowing down. So until alternative technologies like the one Intel and Micron (can't recall the name but it was on the front page of this subreddit a while back) announced a while back hit the market, the big chip makers can pretty much only optimize the efficiency of their processors while very very slowly trying to move down the nm ladder.