There is a story, as on the eve of the Great Depression Rockefeller was cleaning his shoes from a street cleaner. And the cleaner asked him if it was worth selling shares or waiting a little longer? After that, Rockefeller called his stock exchange broker with the order to sell all the securities at once: "If there is already a shoe cleaner on the stock exchange, then there's nothing for me to do!".
Even if this story is fake, do you think it can happen with bitcoin?
LoL, funny story from a shoe cleaner, I guess.
Consider Rockefeller wealth, this family could pump bitcoin from $1000 to $7500 instantly, within a month or in few phase within a year, collecting so many bitcoins for them.
Waiting bitcoin increase even bigger, maybe $15,000 or $20,000 and then cash out their investment. We may see this digital currency crash again as people will follow to panic sell, it become a bigger snow ball everyday. But, bitcoin has so many supporters around the world, and it's not easy to manipulate bitcoin price, in this case; the Rockefeller family may not invest in bitcoin at all.