> WebRTC is likely to increase Skype's business (assuming the do a WebRTC implementation),
How so? Are their servers for sale and somehow they can license them so web clients can conference via them. Otherwise I don't get. Or are you assuming they will buckle and would be forced to implement the WebRTC protocol.
Skype makes money from call-out (to traditional telecom services), call-in (give a traditional telephone number to a Skype address) and additional features (conference calls).
WebRTC increases the potential market for all of those things by decreasing the friction - people won't even need to install the Skype client anymore.