Don't let the Bitcoin price be stable because if it is stable then it is definitely possible for the Bitcoin system to become centralized, this is impossible.
But if there is one company that owns 80% of the total Bitcoin then it is certain that the price of Bitcoin will be manipulated fraudulently or the price of Bitcoin will be stable.
But to have a value of 80% of the total Bitcoin seems very impossible because maybe the company should have around 17,000,000 Bitcoins out of 21,000,000 Bitcoins.
That's a lot of value for a company to buy around 17,000,000 Bitcoins and that's why I say it's impossible.