In 10 years one BTC may be equal to 10 today's Bitcoins in value. I'd say 2-3 BTCs will be enough for most people's retirement in 10 years. One BTC valued at $300,000 is very possible in 10 years so having $1,000,000 should be enough for anyone's retirement. I'm pretty confident BTC can reach the $1xx,xxx target in 1-2 years. After this, to the Moon!
In my opinion, no matter how much we buy bitcoin today to guarantee retirement, it is returned to lifestyle and needs, if for people who like glamor and always appear to exist with expensive things, of course, having 1000 bitcoins will not be enough and retire if you have style. life is more extravagant than what can not be imagined, in my opinion, it is necessary to adjust the calculations and budgeting requirements for retirement later and estimate the price of bitcoin as a straight line for preparing the budget for pension fund needs.
I understand that the price of bitcoin will increase in each cycle, but the price of bitcoin is also quite volatile, so it would be nice to also have other investments that provide passive income every month, even though not much is produced.