I'm actually of the opinion that when we can't scale smaller we will then scale horizontally/laterally.
More transistors, larger chips.
We have bought so much physical space going smaller and smaller - and I think a lot of people will happily pay for a thicker iPhone if it's not more room allocated for a larger battery.
Eventually - when that becomes ridiculous - we will write better software. More likely we'll buy an extra couple years after the end of Moore's Law and Intel will make some unexpected breakthroughs to go smaller again.
Color me cynical?