What you say is unlikely to happen, if it happens then there is a huge manipulation in the world.
Obviously, he wants to also have the power to manipulate.
I think that's crazy. if someone buys all the existing btc then who will buy back and maybe the btc will die
Just to remind you that bitcoin price has ups and downs so if it will have a correction then people who already sold their bitcoin will surely buy back. So how come it will die if there's a huge demand?
OP shouldn't go all in one certain price as the price is really a roller coaster ride, don't be a FOMO just because this is the trend instead know the risk in every aspect of investing.