This is a nice tool and there have been some like it already (https://appear.in/) but Skype's killer feature is that it has a list of people I know that I have added, saving me the trouble of emailing URLs or scanning QR codes. The problem with this is that it requires me to already have established contact with the person I want to video chat with, in order to share the link. With Skype, establishing contact, initiating a call and video chatting, all can be done through the same software.

This is why Skype-killers don't take off. Hangouts has made some inroads because it also has a list of people already present. If only it was as reliable as Skype in low bandwidth environments and not bundled into an intrusive Chrome app (it actually blocks a little part of your screen if you want to stay online, the extension has no offline feature, etc.)