Again - get real. 1% of the world economy is ~ 300,000,000,000.00USD.

That's 300 billion. The total amount of coins ever is going to be 84 million.

It means that in that rate a coin will be worth ~3571.42$ per coin.

If it goes so high inflation will destroy world's economy. It might go to 1000000$ per coin, then drop to 1000$ because there are no real money to cash you out!

Do you get it or shall I explain in more detail?

Let's get it a bit easier.

If a bitcoin is worth 100$ today, and there are for instance (just an example) 1,000,000 BTC traded every day through MtGox, it means that MtGox needs 100,000,000$ to exchange all these. However if it goes to 200$ for a single day it will need 200,000,000$. Do you really think they have that kind of leverage? Who is their liquidity provider? The Federal Reserve?

If it gets so expensive so fast it will burst. Yes it might increase in value, but it shall happen within reasonable timeframe of years in order for the exchangers to be able to adjust the volume and money supply they currently have. Otherwise a lot of people will end up burning up graphic cards and all kind of equipment for mining and thousands of BTCs worth nothing.

Another thing that no one thinks about and no one can control - greed.
Most of the bitcoin exchange is done by DIY traders, not miners. When it gets expensive, they sell. Period. They do not care about the whole picture.
If Gox bankrupts it all goes south.