we don't need mixers as we got something far more superior: stealth transactions
First of all, people smarter than me have indicated BTS transactions are subject to heuristics and other analyses techniques even when using stealth addresses and confidential transactions. This is what the Cryptonote camp alleges. They argue ring signatures and stealth addresses, plus confidential transactions provides more privacy.
CT plus stealth addresses is not "more anonymous" than Monero. Mostly the two aren't comparable (both do something the other doesn't), although Monero is arguably somewhat more anonymous, as I will explain.
Privacy/anonymity consists of:
A. unlinkability (can't tell two transactions are to the same recipient): stealth (or just not reusing addresses)
B. untraceability (can't trace paths between tranasctions): ring signatures (or coinjoin, coinswap, though with many complications and hazards, etc.)
C. content privacy (can't see amount being spent): CT (or limited ambiguity of which outputs are change)
Bitshares with CT gives you A and C, but nothing at all for B. Monero gives you A and B, and somewhat C (via ambiguity of change outputs). Monero with ringCT will give A,B, and C, for a comprehensive solution.
Second of all, I meant add mixing services for major coins like Bitcoin and Litecoin similar to the way bridges/gateways work.. integrated into the wallet. Everyone benefits from the fees associated with such as they are destroyed.
Edit: Spellchecker on my phone is a PITA sometimes, plus I elaborated a bit.