Shouldn't people just start using GRIN instead and be done with the mixing services?
I suppose it's not as helpful as mixing services because there are cases when you just want to send BTC and nothing else, but overall GRIN has many advantages,
A) You don't need to trust a 3rd party (the mixing service) to send anonymously.
B) It's even more anonymous than mixing services since you can transact without even having a public address, but instead by exchanging a transaction file with the other party *.
C) There are no fees to be pay in a 3rd party and even the network fees are very low.

*I don't 100% understand how this works, so I might have said something wrong in point B. If anyone cares, you can try understand it more deeply by reading here: https://medium.com/@brandonarvanaghi/grin-transactions-explained-step-by-step-fdceb905a853

I guess it's still a bit too complicated to use GRIN, but hopefully this will change soon in order to provide people who want anonymity so badly with a great alternative to mixing.