I think what is missing is also a list of the problems we want to solve, as there is surely others solutions than “decentralize everything”, especially since decentralization come with its own set of problems.
For example, the problem of void linux with a key figure that disappeared is a SPOF, and there is several way to deal with it, not all implying a fundamental shift in the infra side.
There is also the question of the impact. If discourse right now disappear, this would be bad for the project, but not impact that much long term, nor impact the user community.