Well, personally, I'd keep it.
If you changed your mind later, you may not be able to find a Wii for quite some time.
Also, I usually go to another website for Wii news, but I much prefer discussing the news on here. It just may taker a little bit to have a thread on said piece.
I'm debating whether to get a 360 at some point. I just don't think there's enough games I'd be interested in. Also, don't like the thought of subscription charges if I wanted to play online. Still, that's just my opinion...