Geo nodes will 100% revolutionize Blender’s particle system as used with this course. I’ve no doubt we will get to work on geo node courses and/or courses that feature geo nodes ASAP.
I should also say that as long as Blender’s particle system exists, it remains useful. I’m working on a freelance project that’s using particles instead of geo nodes and it’s perfectly viable. In other words, new tech doesn’t immediately negate previous tech.