This is the armour-piercing question that will never penetrate Bob's concrete-thick skull:
what makes him indispensable? No, really. There is an entire galaxy full of YouTube critics and commentators, many of whom are better than Bob, so would anyone truly miss him if he died in his sleep tomorrow? There will be the idiots who mourn the loss of a "titan," but even they will move onto other content creators while Bob becomes a fading memory. Look at legacy. His biggest accomplishment in life is
Brick By Brick, which was an embarrassing autobiography and a written form of a Let's Play that was already obsolete in the era of YouTube. Even that was a paltry and ultimately futile contribution to the written canon of Western Civilization.
Compare to Bill Watterson's
Calvin and Hobbes, which is fondly remembered nearly a quarter-century after Watterson retired the strip.