Steemit & Dtube is ONE replacement. I think it's unlikely that any one site will be able to monopolize things the way Youtube did. And that's a good thing. It means that a given site can't change rules willy-nilly and screw their content creators. My LetsPlays were doomed because a single site decided to change the rules and gameplay footage of a scary game isn't "Advertiser Friendly". - Hence why I'm uploading here :)