I'm not convinced von Neuman probes are actually feasible. For one, you'd need general artificial intelligence because the task of setting up a production line

I'm not convinced von Neuman probes are actually feasible. For one, you'd need general artificial intelligence because the task of setting up a production line on a different planet is incredibly complicated. Then you'd need to move a lot of mass across star systems. Tiny replicators are not going to survive the harsh conditions on other planets, and then find and extract all the resources you need to build bigger machines. I'm not sure what the minimum feasible probe would be, but I guess a lot bigger than everything we can send into space now. Finally, I'm not sure interstellar flight is realistically possible. Especially if you are not sending solar sails or rice corn sized probes, but a payload the size of an oil rig or bigger.