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.
Doubtful, that may create new awareness to some people that did not knew about bitcoin, but it is difficult to imagine that will change the overall perception of bitcoin, at best that could raise the price a little bit but the effects of such a thing are going to be limited.