Offer was for each country to suspend 50% of their land and offer to the cosmic guest. But......

The division did not fair well in many locations thus setting off problems between neighboring countries.

The offer was stalled. A new plan was drawn, nobody fairs well and time has run out on negotiating any further details. Most populations will attempt to squeeze into south America, the outcome is yet to be seen.

Many of the wealthy have built subterranean mansions there over the last two decades.

Antarctica will be drawn into seasons from ionosphere dethatchmentation.
Then it shall become a resort. 1/16th is a mine.

Not many Umans shall be expected to remain. Those that are, will be brains infused to machines and known as "Uons".
There are currently 475 Uons today, one is a well known celebrity.
Unknown who that Uon is, only that it has fame.

Total machines serve as intermediaries between Umans and the Aliens.

Umans will not live off planet anywhere in the galaxy.