These guys are either delusional or evasive. Whether justified or not, when you attack a large percentage of your base of AdSense partners, both your ad exposure on the web and your revenue declines. The real problem is likely because the chickens are coming home to roost.
The world's top Web search engine attributed the 12 percent drop in its cost per click (CPC) for the first quarter to a shift to cheaper mobile advertising rates among other factors.
A lot of businesses are spending less on AdWords because they are not seeing the same payback that they once did because the US economy is not improving as much as we are led to believe. The proof is in the number of major retailers who are on the verge of bankrupcy, such as Best Buy.
Also, advertisers are not moving to cheaper mobile rates in large numbers. Most advertisers are not even aware of it. Mobile advertising works for a relatively small number of local businesses. It doesn't work for most. I track mobile traffic in AdWords for a number of companies and the best that I've seen thus far is 10% of total traffic. For most AdWords advertisers it is less than 5%.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin