I’ve taken one trip in the last 15 years where I flew, so it’s pretty rare for me anyway, but hopefully, improvements to train infrastructure in the US will lead to more people taking that route. Idk if battery tech will get to the point where jets can be run off them, but I could see them moving over to renewably-generated hydrogen. Use solar/wind to generate hydrogen and use that hydrogen in jets, large construction equipment, farming machinery, etc.
And while I still eat meat, I’ve been moving towards more plant-based foods whenever I can.