I propose a new metric: Savings Ratio.
In a prior thread, we had some disagreement on Gross vs Net savings ratio.
I see the downsides of both, and I think this address both issues:
Savings Ratio = Savings all sources(401k, debt principle, taxable, roth, etc) / Spending all sources(debt interest, food, insurance, toys, cars, etc)
The equivalent of the 50% club would be the 1.00 club. :-)