Since 1975, there have really been only three immediately significant changes in U.S. end user "time spent with media," clearly evident in this chart from Veronis Suhler Stevenson.
Though it now seems "everybody" plays video games, consumers actually spend far less time playing video games than they did in 1975.
The big gainer, in terms of time, is cable, satellite and telco TV, which shows a steadily growing time commitment.
Radio listening has been significant since 1975, but now is in a decline. Aside from those three media, most of the others have trended within a relatively finite range since 1975.
All of that might suggest one clear implication: any media that makes dramatic gains in the coming years will probably do so by taking time away from multichannel television services, radio and video games. That doesn't mean the alternatives have to mimic the value of the displaced services, simply that the rising services will have to become more compelling, compared to radio, multichannel TV services and video games.