The project is open source so it would keep going, at worst case people could fork it or whatever. They would just lift up one of the maintainers to take Linus’ job. I don’t know how this would apply to the Linux foundation, but I think he still would be replaceable, it’s all designed that way, because IT sector wouldn’t have all it’s eggs in one basket that might break if one guy leaves or dies.
Every social media that isn’t under anglo american control is a possible threat to the current global order. We have all seen this.