My rear tyre is pretty well worn now. Normally I'd replace it but, as it's my first foray into tubeless, I'm leaving it to the bitter end as an experiment. It has one inside patch (repairing a puncture from before I took the tubes out), and a Stan's Dart (not a show-stopper, it sealed at a reasonable pressure to get home, but needed repair to hold 50psi).
Still not sure about narrow tyre tubeless though.