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One of the main reasons for Bitcoin's value is that the supply of Bitcoin is limited. 21 million bitcoins will be supplied over 18 million bitcoins have already been mined. Because the value of Bitcoin is determined by the ratio of supply and demand. Day by day the demand for BTC is increasing and the number of Bitcoin holders is increasing due to the growing population and the price is likely to increase in the future. Experts believe that competition between holders will increase the value of BTC in the future when the supply of Bitcoin reaches 21 million while mining Bitcoin will not.
You have said it all, and I prefer the first point of the statements that stated the Total supply of Bitcoin, which is limited to the world, soon or later Bitcoin demand will be very high because of the supply in cryptocurrency market industries, hence Bitcoin still in better position to invest for future time holding.