Debt is a problem, but it's hugely overrated. Everybody is talking about the debt problem, so I'd like to take more contrarian position. Here are 180 years of economic growth (log scale): 
I believe that investing in a good index fund is still the best solution.
Growth in my mind does not have to do much with debt as the growth of debt and the economy are not correlated, as my chart outlines.
So i agree there will always be growth and betting on that is a great idea and i think that is something that is somewhat of a law of this world.
However I think debt is an artificial problem created by our monetary system that needs to be resolved somehow.