They say that fossil fuels have roughly 50 years left, but they keep finding hidden oil patches at the bottom of the sea. Who knows they may find a large storage that may extend the future.
With global warming, people say that fossil fuels cause it, others say it doesn't. The truth is Airbus and Boeing wouldn't have recently released new aircraft if the future wasn't looking very convincing, they have done in-depth studies and believe that there will be a successful future in aviation.
As for companies wanting pilots, they need more and more pilots daily and it seems to be going up, this is as long as there isn't a repeated terror threat that caused a huge boom for many pilots (9/11). If something like that was to repeat itself (god hope it doesn't) then you may be stuck trying to land a job for a while, however there is risks like this with a lot of jobs.
Anyway, it shouldn't affect you in your life time pal.