The proliferation of mobile makes web traffic go up, not down. Mobile is a bigger slice of the pie, but the entire pie is bigger. Desktop web traffic itself appears to be growing, not shrinking.

I've had to correct the distortion of these numbers before (https://news.ycombinator.com/item?id=5847337), and I'll do it again. Using Wikimedia as an example, as mobile accounts for a bigger share, overall traffic is growing significantly, and even desktop traffic is growing, not declining:

Wikimedia June 2012: 149,085 M requests - http://stats.wikimedia.org/archive/squid_reports/2012-06/Squ...

Wikimedia June 2013: 223,725 M requests - http://stats.wikimedia.org/archive/squid_reports/2013-06/Squ...

As you can see, Windows declined in share from 70.45% to 56.10%, but total number of Windows desktop requests grew from 105,035M to 125,520M. Similar pattern with Mac Desktop.

Mobile means more web traffic, not less, and desktop web traffic is also growing.