Unless I'm misremembering (which I very well might), I seem to remember ForceWiFiOn (or whatever the exact setting's key is ^^) persisting after Nickel's demise (at least until the lease expires, I'd assume).
EDIT: Which makes sense, given that WiFi persists in KOReader/Plato if you start with WiFi enabled.
In the script's current form, the point is moot anyway, as nickel doesn't get killed

.