Skype has said they are opening up their APIs. Does that mean we can add SIP to Skype and rebuild it as a hybrid product? If Google, Yahoo, and AOL are all SIP in their VoIP signaling would I care what Skype does?
If Skype were smart they would quickly convert to SIP & SIMPLE+MSRP or XMPP across the board before someone beats them to it. We already know that Skype is using SIP at the Gateway, if they were to use SIP at the endpoint they could really be a long term threat to the portals in particular.