I actually start to think, that because of the scarce nature of bitcoins the price will eventually go up to 1500 dollars.

Now the total economy is 1 billion dollars. There are more and more services accepting bitcoins. Some people get their salary payed in bitcoins. Whether this is stupid or not, I don't know. But we can assume the economy of bitcoin is growing. Maybe at a certain day the economy will be 30 billion dollars, if the total number of bitcoins is reached this will be 1500 dollar for one bitcoin.

Thirty billion is not that big. It is just the bonuses payed out on wallstreet. The drug traffic industry is something like 300 billion dollars. The total GDP of the world is 200 trillion dollars.

On a worldwide scale 30 billion is small.

That's an entertaining thought.