Bravo.
Bitcoin may well be around forever, but that doesn't mean it will necessarily always be the "king", i.e. the digital currency with the highest market cap. Maybe it will be, but there's no cosmic force keeping it that way either--we may see something come along that will be
even bigger.
I personally think the market cap for all digital currency will be 10x what it is today within 10 years. How much of that market will be controlled by Bitcoin? We'll see. Things with such huge market shares often don't stay that way*. But Bitcoin's share can diminish greatly in that scenario and it will still be worth many times what it is today.
Technology, I should remind the youngsters here, has a strong tendency to
change over the long term, and us oldsters have been taken in by so many technologies we thought would last "forever" that we're getting pretty tired of being proven wrong over and over again.
Keep an open mind, people. It makes life more interesting, and you'll profit more as well.
(* I know, I worked on Netscape Navigator** when we had a 95% market share for browsers
).
[ ** For anybody here under 30, that was the first popular web browser, before others like Firefox, Chrome and Safari
]