That's a curious viewpoint, since Monero itself (presently $96.56 at Coinmarketcap) did not reach the value of ETH ($288.53) despite having "mandatory privacy". Meanwhile, Dash ($340.27) has much higher US$ value than either, which suggests that the market is relatively comfortable with its present trajectory. Even if your view is based on market cap rather than coin value, Monero with its "mandatory privacy" is far below ETH so adding "mandatory privacy" to Dash would seem unlikely to propel it "to easily reach the value of ETH".

My own sense of "value" is not based on market cap fwiw, because market cap is an abstraction that tells me nothing about which goods and services I can buy with the coins in my wallet.

Either way, I'll stick with Dash over the other two - ymmv, which is fine, but I don't understand why you would want to come to the Dash thread and suggest that the coin become something other than Dash, especially something of lower value.