It's worth noting that this ~$40B is just for broadcast TV ads. This excludes cable TV ads (~$30B) and subscription TV fees (~$80B). There is an ongoing non-zero sum shift in attention and dollars to online, but TV is far from dead.
Funny that they lumped together very different digital channels (search, display, mobile), and yet decided to keep TV Broadcast and Cable TV as separate line items. That's intentionally misleading at best.
(disclaimer: I work in the area, and have a vested interest in the growth of digital ad revenue. But I still feel offended by these pseudo-researches)