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There is no reason why Monero cannot add the same type of value to Dash pending the development of Dash Evolution, including the speeding up of Darksend and the blinding of the masternodes. I noted this on another thread.
Mixing Dash is actually very simple.
1) Sell Dash for XMR on Poloniex
2) Send XMR to own XMR address
3) Send XMR to a second XMR address with a mixin of say 5
4) Sell XMR for Dash on Shapeshift.io
Voila! Mixed Dash. No need to wait for weeks or worry about masternode blinding.
Edit: When sending the XMR to Shapeshift.io also use a mixin of say 5
1) Sell Dash for XMR on Poloniex
2) Send XMR to own XMR address
3) Send XMR to a second XMR address with a mixin of say 5
4) Sell XMR for Dash on Shapeshift.io
Voila! Mixed Dash. No need to wait for weeks or worry about masternode blinding.
Edit: When sending the XMR to Shapeshift.io also use a mixin of say 5
Cross chain mixing using Monero does work right now.
The ironic thing is using your methodology also makes Dash useless as well.
People who are hard-core Dash fans can't do that because it would be like sacrilege and blasphemy to the church of Dashintology.