They already are allocated that way, just not in a nice, organized manner. Humans take up much less space on planet earth than you'd initially expect.

If you only count individual human beings you are severely undercounting

In addition to agriculture & food production, transportation (road+rail), strip/open pit mines, and you have just take a look at

https://karolinanwk.files.wordpress.com/2012/04/garbagepatch...

Food production takes up almost half of the planet's land surface and threatens to consume the fertile land that still remains, scientists warn.

The global impact of farming on the environment is revealed in new maps, which show that 40 percent of the Earth's land is now given over to agriculture.

http://news.nationalgeographic.com/news/2005/12/1209_051209_...