LOL but I have to disagree with you. The world is pretty much full up. Certainly there are places - such as New Zealand - which have good soils and plenty of room but the Third World can't get to them. Try walking from Ethiopia to Australia.
Even if they could, you'll note the Aussie navy is busy full-time capturing refugee ships and stopping people doing exactly what you want them to do. There are even boats headed for NZ
And people do vote with their feet - hundreds of thousands have flooded out of Somlia into Kenya. The poor Kenyans aren't a lot better off and can't cope. For the starving of the world there aren't lands of milk and honey next door that they can walk to.
On top of that there are soldiers on borders and minefields. Armed men routinely attack villages and refugees all over the world. Consider Darfur and the Congo. Oh, and Ivory Coast.
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