Well, I'll be more positive here then, I'm going with 5 million U.S dollars here. Since for sure we are still early these days.
There is nothing wrong with being positive, but you also need to be realistic. When you say 1 BTC will be worth $5 million, do you take into account the fact that there will be a total of 21 million Bitcoins, and 99% will be mined by 2032? According to that calculation, all Bitcoin would be worth $105.000.000.000.000, which at the current value on the markets would be more than the value of all gold + stock markets + all coins/banknotes.
https://www.visualcapitalist.com/all-of-the-worlds-money-and-markets-in-one-visualization-2020/
Amounts like $500K or $1 million are very possible, even within the next 5-10 years, although like past bubbles I don't think the market will stay that high for very long.
If we follow the examples from the past, after each big bull rune comes a correction that can be as much as 90%, and a crypto winter that can last at least 3+ years. Let’s say the next bull run raises the price to $100k, and then we go back to $20k, and then again we wait for the crypto winter to pass to have a new bull run. Unless BTC becomes something that the states will buy officially, I don't see how it will even be possible to reach the figure of $1 million per BTC.