an amazing feature of Bitcoin not often discussed is if you have them all they become worthless.
Yep, it's really this simple. And most likely you don't even need all of them to do that. If you get like 75% of them, it means lots of people would've sold all they had and what Malawi said happens.
Price would first skyrocket, bringing out coins from cold wallets. Then as the rich guy had basically all BTC, everybody else would loose interest and switch to another crypto.
There has to be a distribution of BTC's for them to have any use and value.