Why must EOS go to $1000? $1000 EOS would give it a market cap op $900 billlion like you said.

For Ethereum to get a market cap of $900 billion it must go to $12,000USD

Why is that so much more unlikely?

You have some sort of weird backwards logic, or you have misunderstood what is important to value.

The price of the coins is uninteresting. If here were only 10 EOS, each EOS would have been worth 1 billion each. If there were only 100 EOS each would be worth 100 million, etc.