One possible reason why the skill premium is declining

This is especially true for those jobs that require the rudimentary use of technology. Until relatively recently, many people could get to grips with a computer only by attending a university. Now everyone has a smartphone, meaning non-graduates are adept with tech, too. The consequences are clear. In almost every sector of the economy, educational requirements are becoming less strenuous, according to Indeed, a jobs website. America’s professional-and-business services industry employs more people without a university education than it did 15 years ago, even though there are fewer such people around.

Here is more from The Economist, quite a good piece.  Of course this is also a reason why smart phones are underrated.