10 years more surely the development of cryptocurrency will be increasingly widespread and accepted by many people, but crypto remains an alternative and will not be able to delete / replace the fiat function.
I'm gonna expect that 10 years from now we will be able to enjoy the fruits of our investment.
Whatever coins we are holding now as long as it's legit and we see that the team is working, it has a chance to grow many times as that's the trend in crypto. In addition, as the adoption increases and crypto market more regulated, people would be confident to invests not only in bitcoin but in altcoins as well, so that gives us a for altcoins to grow and knowing they are very cheap now, they might grow 10 times or more over that long period of time.