One theory is that this huge debt will be inflated away in the aftermath of the next crisis. Central Banks have no other option (they won't let banks be destroyed).
Gold and other hard assets should be beneficiaries, and that tiny, very tiny spot called cryptocurrencies.
It has been told ;)
Personally I just like to speculate. I see the signs of a possible financial crisis again, buts that's all the are, just signs.
But the asymmectrical returns are worth being bet on.