Here’s one from Ripple staff....
https://s3-us-west-1.amazonaws.com/fundamental-valuation-framework-for-cryptoassets/A+Fundamental+Valuation+Framework+for+Cryptoassets_June+2018.pdf
One way to see money flowing into crypto and the proportions of flows to what coins is:
https://coinlib.io/global-crypto-charts
In the following chart you see that most volume is Tether volume... and that XRP is not loved much by fiat at the moment... that might change if we start to see significant usage as a cross border bridging currency.