A bit of entertainment for young ones and perhaps cathartic in some way for those who disrupted the meeting but in terms of positive impact on anyone then we all know it's going to be pretty much nil.
Sadly, I think there is pretty much zero chance of getting through to a mentally in Witness through any kind of direct action like this. It's water off a ducks back thanks to the demonisation of apostates.
Every single person I know who has been labelled an apostate is considered either a nut job, embittered or a self reliant egotist - usually all three.
I think sites like this, jwfacts, jwsurvey, jwstruggle and others where it is possible to find reason, logic and open debate are fair more useful in guiding those who are waking up to the resources they need to resolve the cognitive dissonance.