No, politicians should not decide, nor do they have the right. Of course, the Chinese have done so, but that is wrong. It may be stabilizing their population, but most here would agree that abandoning baby girls just because the parents wanted a boy is wrong on so many levels (boys are prized in China).
I think it is a decision that all of us need to come to on an individual basis. It won't happen until the effects of over population hit home, but it very well may eventually. I suspect that no Western politician will even udder such words in this century- it would be career suicide. But to counter that, just like every other creature on this planet, we are programmed to proliferate our genes at any cost. It's very hard to counter instinct.
I don't have any kids (much less a girlfriend- hallelujah- I rather enjoy doing what I want, when I want right now). I've actually thought long and hard about whether it would be a good idea to introduce a new human to the world one day, much less in America where a single person consumes so many resources. I haven't really arrived a decision, but I would be satisfied with one child- good enough- the genes have been passed on.
And yes, I did hear about the asteroid that will be making a close approach in November. Evidently it will be closer than the moon at some point. It should make for an interesting night sky if it can be seen. It makes you think though, as it takes just one asteroid to end it all or most of it. It's a shame that Jupiter didn't grab it and give us yet another cosmic firework show, i.e. the 1994 comet, 2009, and 2010 impacts. Heck, without Jupiter's massive gravity grabbing every rogue object we probably wouldn't be here.