Mmm-kay... Yeah.
Well, here's the deal... Sooner or later, we plan to make GameTavern a multi-console site. But, as BreakABone said, just give it time. We're in no sudden hurry.
GameTavern, as Angrist mentioned, is a GameCube site. The plan was never to go multi-console, but that rather just came into view over time, as things progressed.
As for it being called "GameTavern," well, don't take that for anything more than the name of the site. That name was specifically chosen so that this place would never be limited to one specific console. When it was first opened, it was planned on being a GameCube-related site. They (Cam and Crash) just called it "GameTavern" so they wouldn't be roped into covering a certain console or company. That way, if one day they decided to change over to covering Sony, they could. The name is un-biased as far as what it can enclose is concerned.
The original plan, however, was to cover the Nintendo GameCube. That name just provided some sway regarding what they could provide coverage for (If it had been named "CubeTavern," they couldn't just switch over to PS2 coverage one day, could they?).
As for when we're going to make our changes... Well... We aren't really sure. BigJustinW said, "
...but it's not moving along as fast as it should." You don't know that. For all anyone knows about the site's status, it could be ready to launch multi-console tomorrow (It isn't, of course, but it could be.

).
If things go the way we want them to, GameTavern will (one day) cover more than just the GameCube. Things just aren't ready quite yet. Still planning, still planning.
And as for deciding who could write what... Well, don't get too excited about that just yet. When the time comes, and when we've decided on what exactly we're going to cover/how exactly we're going to cover it, we'll make those calls. The multi-brand GameTavern is still a long way off. No rush yet.