I heard, a while ago, a good point regarding technology, development and more importantly the aspect of fuelling it all that you brought up.
Some people call this the oil age, it's in our cars, our materials, our machines. Big business, hinge of power etc etc. Two things:
*We do have oil for hundreds more years
*We're living in the oil age, but the stone age didn't end because they all ran out of stone. We just move on and find better, more sustainable ways of doing things ala bio-fuel, wind-farms, solar and all that other good stuff.
I've often wondered if technology will ever reach a point where we look back at it all and say "Yup, we've literally perfected everything. Nothing ever breaks, noone's ever sick, all needs are covered..." and so on. Honestly, I feel that certain fields can reach that point without needing to fall into an endless, self-consuming cycle that eventually sucks us all in. ON thet tech side, look at firearms. Initially, proper guns were just cannons, then overtime those cannons became small cannons, and htose small cannons became smaller cannons, and those smaller cannons became so small a strong man could operate one on the move. Then eventually it all boiled down to the point where we had firearms that could fit in a man's hand. Now tell me, are modern pistols so small that you could accidentally swallow one? Of course not, that would be pointless. No, size-wise we got them down to a point that worked, and since then all they've had to do is focus on things like accuracy, power, clip-size etc. Hell, look at the AK-47. Made over 60 years ago and still widely used today.
Furthermore, there comes a point when certain people just don't
want more advanced technology. If you go judging the human race by the kind of shallow, tech-savvy gadget geeks of the world then of course that would culminate in a never-ending cycle of advancement for the sake of advancement. However, if we're going to do that then we might as well judge it all by those
wandering Bakhtiari people in The Ascent Of Man, still just roaming the countryside with their simple little tools, their livestock, the clothes on their back.