Claiming that air travel will not exist at any point in our (or our childrens') lives is not reality.
If we're talking about the Future, we are not talking about Reality.
We can say anything we feel like saying about the Future: most people do.
But my position is logically consistent.
I understand from the information I have received that unless Humanity dramatically alters its course in the next 2-5 years (I always use whichever upper or lower bound is most likey to provoke a choleric reaction in my respondent), then the Planet will become uninhabitable for human beings in the next 30-100 years (see above).
And so either Humanity transitions in an orderly fashion to a Holistic Management System that ensures Balance and Sustainability for the foreseeable Future...
Or it transitions in a disorderly fashion to either a Mad Max-scape; or worse, some disparate collection of tree-hugging communes.
Either way: not a lot of room for people to keep flying, or consuming any form of fossil fuel where it isn't in the vital interests of Humanity as a whole to do so.
Thing is, y'all have left things a bit too late. You've been befuddled and anaesthatised by eHits of gratification, and been ignoring mounting problems, hoping they'll go away by themselves.
Or at the least, that someone else will sort it out; or more hopefully: that the whole thing will turn out to be a false alarm.
A lot of us are still doing that.
It's just a basic Life Lesson that you hope for the best, but plan for the worst.
Humanity isn't doing any planning, and it is still making things worse.
No-one who wants to enjoy a shred of credibility - not even Foota; and he can make a shred of credibility last a looong time..! - disputes that the way human beings are collectively going about their lives, is harming the facility of the Planet to sustain human life.
It's just a question of people speculating about the extent of human culpability, how long we might actually have left, and what, if anything, could or should be done about it.
Which sounds just like 99.9% of meetings I've ever been in.
Meetings where dissatisfaction ran high, and Productivity disappeared.
Nobody can say for certain if this is an Existential crisis for Humanity, because nobody knows what the Future holds.
If we survive, it won't and probably never will have been; and if we don't survive, the Cassandras will turn the Deniers into fuel.
But that's speculation about possible futures.
In Reality, Humanity has been alerted to a potential disaster that will make all previous man-made and Natural disasters look like fisticuffs in the rain.
It is up to each of us as individuals to assess the credibility of that threat, and act according to our best senses and experience.
I can see how we get through this, if we really want to.
But I'm afraid to say that we won't be using aeroplanes to fly around the World; or rockets to explore Space.