It also could go to nothing any year, as audiences move on or a youtube algorithm change murders his watchtime (Patreon a little less risky here but it could shrink as watchtime/new audience shrinks).
Two months later it’s starting to recover but that’s not the bedrock of a business you’d like to build upon.
Plus, we're already seeing alternatives (or rather, in-parallels) becoming quite established, most notably Floatplane and Nebula as created-by-youtuber(s)-who-wanted-an-off-platform-alternative.