That's definitely true, but wouldn't rangers be more ideal? They come in a better doctrine and are just as good as para except for more open maps where the 30 cal paras do better. I'll probably still use Airborne after but having two less relevant abilities hurts the doctrine.
Any change that helps usf teching will make airborne worse relative to heavy cavalry. Heavy cav is great for when you want to side tech (we made side teching better, so heavy cav benefits). Airborne is great when you dont want to side tech (as you said, we made side teching better, which makes airborne worse). Essentially, airbornes job is to make up for bad faction design, so, unfortunately, when usf no longer suffers from this (or suffers from it less), airborne does lose its place.
Sorry if it seemed like I was discounting the idea - yes, ideally relic would descend from the sky and tell us there would be a rework to airborne. Given the likelihood of that though, id settle for paras at least being naturally a little more viable in exchange, seems like the best that can be done.
(Btw paras > rangers)