Poppycock! Ethereum. Supply is gifted to already rich stakers, constant tail emission meaning the supply will approach infinity and while I do believe it will continue to sink versus Bitcoin, it's not doing nearly as bad as all that would suggest. There are far better theories to describe why Dash has under performed, which we've gone over ad nauseam.
You're comparing apples with oranges. Ethereum has an on-chain sink, Dash does not.
It's a completely different economic model because the tokens are consumable and used by the chain itself to pay fund on-chain services, so it's a business services archetype, not a monetary metal archetype like Dash which inherits bitcoin's model.