If they manage to HODL that long, yes. remember, theres thousands upon thousands of people who bought bitcoin at 0.02 - 20$ a piece, but if they all sold before prices could reach the current level of 5.5K they didn't become millionaires either. A lot of people want the quick profits; if they buy 500 coins at 5$ a piece, and suddenly that coin is at 50$, they usually won't wait until prices may or may not climb higher to 100$ or 200$.
If you pay for something, its hard to stay cold when it goes up 10 times in value. Usually is too tempting to sell and take all the profit. But the fact is, projects need a lot of time to develop and just idea itself wont be enough for contentious price raise.
True and only people who forget if he ever bought something and realize it after the price already at the moon which usually become very rich. If we followed the development of something, it'll be so hard to keep holding our coins after it increased 10x.
The thing about bitcoin, is that is a coin for pump and use, is literally used for everything, so it will only rise until it reaches a stable amount when it b comes mainstream, and due to its limited supply, then its obvious now that it will rise that high and more, but other cryptos, which there use or demand depends on just one or two features, will make their price climb to a certain degree, even if it becomes mainstream, the thing is to determine which is the maximum price it could possibly get.