We need to put things in perspective.
The reality is:
The US has greater inflation-adjusted GDP growth than most of the world, including much of Europe, the Middle East, and South America, and Japan http://i.imgur.com/SBqFqtt.jpg
Profits & earnings for tech companies, payment processing, retail, and consumer staples companies have far-outpaced GDP growth. A lot of the lag comes from the chronically weak financial, commodity, and energy sector.
It's much harder to grow a large economy than a smaller one. There's diminishing returns to scale. It's harder to grow an economy at the same rate it was growing when it was 10x smaller.
2% real GDP growth, while slow, is still growth. Most people cannot perceive the difference between 2% growth and 7% growth.
Real GDP is back to 2003 levels, and far fewer people were complaining about slow growth back then
Slow growth doesn't preclude discovery and innovation, things like web 2.0, smart phones, apps, theoretical physics, mathematics, uber, self-driving cars, on-demand entertainment, etc.
So while more growth may desirable, 'slow growth' isn't too much to lose sleep over.
A lot of ppl have mentioned the UBI, but it's worth reminding that the effective income tax for the lowest 20-40% of earners is negative