I don't get the darksend talk as it's not even opensourced yet.
A better option may be something like Fedora's coin mixing, which if I recall correctly, wasn't really decentralized... but it's better than nothing.
Darksend is not decentralized either. They promise they'll make it decentralized but it's not yet.
My point being, DarkSend isn't opensourced yet, so why do people act like it can be added?
Noneone is acting like it can be implemented anymore, we are going to implement just a mixer. Besides, I head rumours that it's going to be open source on May 25th.