What's funny is to see someone in their first paragraph nit-pick the use of a single word ("so") from the article, and then in their second paragraph go on to grossly misuse a phrase ("patent troll").
It is not patent trolling to ask for licensing for patents that you developed and that cover technology that you use. It is in fact how patents were designed and meant to be used.
You make a good point. The guy "estimates" $15 per license and then uses this estimate to draw conclusions, without providing any basis for his estimate. It seems to amount to nothing more than speculation.
Regardless it's funny and sad to see MS acting like a common patent troll. Sure they need revenue but they have resources to produce stuff.