Saying CGI animation could potentially be on its way out is like saying animation itself could potentially be on its way out. In that case, it's not the medium itself that's the problem but the way in which it's used.
Hollywood's current homogenous, assembly-line style of animated filmmaking may one day collapse on itself because the industry's sheer size may give way to a lack of innovation and tepid competition. But computer animation as a process is technically limitless; it's brutally efficient and capable of a number of different styles, including imitating other animation styles. It's driven other animation methods the way of the steam locomotive. Going back to the way things were may be great for purists, hobbyists, and arthouse/indie projects, but CGI animation is worth far more than anyone, including its biggest users, give it credit for.