Perhaps what he should have said was, that there is some apprehension to Adobe subscriptions. The price won't be "Price of Sketch"/"Date of next major version", that's for sure.
Well, besides that, the point I'm making is that, in the example given, there is no implied relationship between Adobe switching to a subscription model and users abandoning Adobe for Sketch. There is, however, a relationship between Adobe giving up on Fireworks and users abandoning Adobe for Sketch.
All I'm saying, really, is that if it comes down to giving my people a raise, or paying for Creative Cloud, the raise wins every time. Especially when the alternatives are better.