WPF is the base for silverlight, so, I have no idea what he is talking about. And I used WPF, it is amazing, period. Obviously there are some legacy resistance, but, eventually they will have to move on. Doesn't matter, newer gen will use it and forget about the legacy people anyway.
And yeah, even VS is using WPF now. And nice looking stuff like Blend is long already WPF. And WinLiveApps finally get rid of XP support, which may likely going to move to WPF in the future. (BTW, yeah, XP can do WPF, but, most people will not upgrade as already happened.)