What do you think are the most important metrics to track the health / growth / utility / "success" of a blockchain ecosystem?

(and bonus points: how can they be measured?)

For me, it's the combination of these 3 matrics.

1. How many new applications are being built? 
2. How much total liquidity available to those applications?

Let's assume, 

An ecosystem has 100B in assets;
* 40% in Liquid Assets (LA) -- moved in the lats 12 months
* 60% in Saving Assets (SA) -- haven't moved in the last 12 months

Assuming that Liquid Assets move 5 times a year, so it's 5x more valuable to applications than Saving Assets. 

Now, the application being built;
500 apps are being built for LA. So, that's 500*5 (=2500) points.
1000 apps are being build for SA. So, that's 1000 points. 

Add them up (3000 points). 

I'm making a lot of assumptions here, but with 3 months of research and fine tuning this can be developed as a long term health metric for any blockchain ecosystem.