Many have half or more than half of their portfolio invested in Bitcoin already
How do you know that?
I don't think that's true , not everyone have half of their portfolio filled with bitcoin
BTC, most people prefer having their money on stable coins like Tether to avoid losses if the coin eventually drops.
when everyone owns a Bitcoin who then will care about it as it will be as common and a boring investment.
I believe this is a treat in the Bitcoin market value, could this actually bring down the market?
Many people owning bitcoin was the main goal so as to increase its popularity and demand for it in the market thereby increasing its value because the market is driven by demand and supply and bitcoin has a limited supply while the demand for it, keeps growing as the days go by, so I don't see anything wrong with millions of people owning or investing in Bitcoin, it's actually good.