20-Year Prospect
Twenty years is a mighty long time in internet land. Sure, it's easy to look at the who's who of Facebook, Google, and YouTube and see them as the indomitable kings of virtual space. But then again, you may have said the same thing about MySpace, AltaVista, and Ebaumsworld a few years ago.
Fortunately, the medium of film tends to be fairly versatile, so even if you can't continue on as a YouTube personality in the future, you may very well end up a Squibblebibbledibs personality instead.
Stay on top of the times, watch out for competing sites, and you should have no trouble bringing your massive audience with you wherever you go. Presuming you actually have a massive audience, that is.