Uh, how about NO? Say goodbye to U.S. sovereignty if that happens.
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Since they obviously aren't going to do it I'm in favor of pulling out of the UN.
However, I do think there is a need for a world organization with a Conservative/libertarian ideology. I'd be in favor of the UN if it prevented our government from infringing on our liberty.
For more on this, see a comparison between the formation of Federal states in the EU and the US.
http://www.neoperspectives.com/constitutionalissues.htm
A UN with negative power would be appropriate (in my view).
In the meantime, let's get out.
A "need"? I don't think so. If other countries want to screw themselves with socialism, I say let 'em. We should just stop giving them money, which is what we're doing now (both directly and through UN organs that encourage socialism).
I'd be in favor of the UN if it prevented our government from infringing on our liberty.
Any world government that had the power to do that would also have the power itself to infringe on our liberties. Only when it's done globally, it becomes much harder to control. I strongly suggest you rethink this.