Earlier quoted context omitted.
It would seem to greatly lower the cost of building a Skype-killer, though, and that's a pretty big deal.
Sort of. Now you don't need to build client software, but that was never the real prowess or power of Skype, it was always the infrastructure. Think of it this way. Skype has 2 things that WebRTC doesn't: Signaling and a Directory. Without those two components, you just have a phone without a phone number :/. Lower barrier, yes. Easy? No, there are still significant costs.
FB is already in bed with Skype though I think so not sure how that would pan out in practice.