So far, Linus has enjoyed remarkably good health. I pray that he will continue to do so. However, like all of us he continues to get older, and in any case people have troubles sometimes.
Imagine what an indefinite period of serious in-hospital Linus illness (starting…now) would do to the project. In a way it would be worse than if he (God forbid) was hit by a bus—in that case presumably someone would step in and try to take over his role, for better or worse. As long as Linus' future status was unclear, I can imagine much confusion about how to handle the situation.
In short, Linus' scalability when operating properly is the least of my worries.
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