The Geopolitical ramifications from Nuclear Fusion finally being achievable is staggering & will show the hands of people who are the decision makers within World Governments as to whether they are genuinely a force for Good or Evil.
Reaching Ignition is a major step forward, having the propensity to produce energy from simple Hydrogen & Helium is MONUMENTAL! It’s essentially like discovering Alchemical transmutation, except on a thermonuclear level that will basically allow for you to power an mass-energy grid that could sustain an entire civilization for the next millennia.
This also has implications that can significantly impact Space travel as well...