IRC will definitely get a more prominent place on the forum. We are looking into how to do something useful with Mumble. If the sessions happened on Google hangouts we could display the youtube live feed on top every time they happen.
Looking into also linking youtube and skype, but those work more like radio shows, not like irc and need a lot more preparation and coordination. At least I don't know how to have a 24/7 youtube session running that is free for people to join and leave as they see fit.
Mumble kinda is like irc with the option of voice. Oh if you are looking into linking the mumble chat with irc that is trivial with this bot
Another problem with live youtube shows is getting people willing to do the show in the first place, just trying to get people to use their microphones is not easy, getting them to use their webcams would be a lot harder. Add to that the fact that there is no regular cast with people with 100% attendance for the hangouts, so who is going to host them? I'm willing to host the streams when I'm around for the hangouts, but I have missed quite a few of them, or was afk.