I don't know the exact percentage, but most of BTC is owned by a few.
So logically, BTC can never become a store of wealth for the masses.
BUT if BTC cannot serve as storage of wealth for all and neither as day to day currency due to very slow and increasingly expensive transfers, what role will BTC play in the future?
I honestly think that it will become a billionaire's toy in the future and coins like XLM which offer incredibly fast and inexpensive transfers, will play the major role in the financial day to day transactions.
So I believe that the people who have just started to invest in crypto should consider these other coins and forget about bitcoin.
If the world will accept crypto as currency, it won't be BTC.
That was a good question with a strong point, IMHO, I believe that there are many coins in the crypto industry that were already surpassed Bitcoin in terms of efficiency in the field of transaction speed and transaction fees, But in terms of popularity and Title Bitcoin has never conquered yet thats why it remains the King of all cryptocurrencies in terms Market Capitalization and because Bitcoin is just limited in terms of supply thats why it gives more chances for price increases and same time act like a store of value SOV.