30 million tonnes of radioactive waste
Suppose you built 200 fusion reactors to replace all the fission reactors in the world. Every 20 years the vacuum chamber of each gets replaced, and goes into storage for 100 years. At the 120-year mark the growth in radioactive material in storage would reach steady-state, at about 30 million tonnes. That's a shit load! Basically you have to allow for the storage of 5-times the mass of operational reactors, for decommissioned reactors. And there is still *some* long-lived radioactivity. Anybody have numbers on this?
Anyway, it'll take them 50 years to study the feasibility of the possibility of a conceptual view using an experimental, scaled-down, and probably non-representative unproven prototype. So who cares.