[friend_and_foe]

Technological advancement doesn't happen Inna vacuum. To get good at things you have to try them. Getting good at the sort of technology required to build such a project requires trying such a project. It's not a matter of waiting 100 years, it's a matter of trial and error for 100 years.

[lkbm]

This is true, but large engineering projects aren't a single technology. There are a lot of ways we'll improve relevant technologies without actually working on this directly. Presumably the fracking industry is improving our ability to model the subsurface, for example.

This also means other industries (such as fracking) would learn a lot from a massive Yellowstone geoengineering project, but other projects and smaller geothermal projects should make this one more feasible and predictable.

(This is how I feel about geoengineering in general: it's expensive and risky, but may end up being necessary, so let's practice on a smaller, safer scale before massive, dangerous projects become urgently needed.)