I very much doubt that. Cooking is a part of every culture. It's more than just being about a healthy meal. For many people it defines who you are. The on-demand technophiles are not representative of the majority.
Evolution took a long time to evolve our DNA. It doesn't change easily.
Like all habits developed over millenia, just because something worked back then, doesn't mean it makes sense now. We had our cost/benefit evaluation slowly tuned to the environment that rapidly (i.e. over last few thousand of years) ceased to exist. A lot of problems we have with each other can be explained in terms of executing adaptations we had from the time where survival involved hunting, and not filling out forms.
Not saying that normal eating is obsolete - just that arguments from nature tend not to be too strong in general case.
The daily hassle of sourcing ingredients, cooking them, cleaning up the mess from cooking etc is an absolute chore.
95% of the time I'd be happy to be able to order a nutrious well made meal and have it delivered, here in the UK where I am your options for delivery are largely "pizza/kebabs" and "chinese/indian" and neither is particulary healthy (the salt and fat levels in a lot of the chinese takeaway dishes are insane, like 80% your RDA).
Having said that, I agree that sourcing ingredients, cleaning up, and all the other upkeep costs turns into a big hassle. Some time ago I voiced the concern on HN and from the answers I learned that generally, like every other task, you can learn to optimize away lots of that startup/teardown costs - but it requires planning and adjusting you daily routine.
Not something I have time to do now, though - changing routines takes a lot of time and effort too.
Pizza was my kryptonite, after a few weeks I stopped craving everything else but Pizza :).