I strongly believe that if some well known investors come in and buy billion dollars worth of bitcoin it could be world breaking news and the price of bitcoin would soar high to $10000, just my opinion.
1 billion dollar worth of bitcoin is 400,000
BTC, and by billionS you mean a couple at least and taht will be nearly 1,000,000 bitcoins. buying that much bitcoin means the price will just go to the moon on its own since the market is still small and orderbooks aren't filled with huge orders yet.
and nobody will do this, and if they do they will do it slowly and if they do do that, they won't announce it to the public. that would be silly.