I doubt that either FB or YT will ever go away. Someday when we find out that they are government operations, people may stop using them but there will always be those who won't believe and will just keep on using them.
I think DTube and Steemit have a bright future for the rest of us. Gab.AI I haven't taken time to explore yet and I've never heard of onG before. Guess I have some homework to do.
Keep up the good work. I'd like to see Lukes videos going up on DTube so I can spend even less time on YT.