I wouldn't think bitcoin tumbling would be used anymore with the emergence of monero, dash and verge being available to use as an anonymous alternative to using these cryptomixers.
There are different risk models to consider here.
DASH and ZCASH transactions have been successfully traced. Verge is a joke; it's Wraith update is literally 4-year-old stealth address technology. Stay away from it.
Monero is the only privacy coin standing the test of time, but we are only a few years in. All of this technology is highly experimental and blockchain analysis companies are working hard to de-anonymize it.
My point is, don't put all your eggs in one basket.
Consider a multi-stage approach to mixing/tumbling. Don't ever assume that any one link in the chain is fully secure. Honeypots are
everywhere, and small cryptocurrency networks (even with privacy features) can essentially be honeypots due to their size.