Tongues a sign...
Great thought in a sermon I heard the other day.
Tongues were a sign in the NT church for the unbeliever (1 Cor 14:22)... largely the Jewish unbelievers, given that Paul quotes Isa 28:11-12. There in Isaiah, the Jews' unbelief would be confirmed with the sign of hearing foreign tongues: invading Assyrians. The point was that tongues in the NT church were a sign of the coming judgment on Israel in 70AD, as they were a sign to the Jews of Jerusalem's coming destruction by Assyria in Isaiah's day.
It isn't conclusive in excluding the charismatic argument, but one can argue that since the event has taken place, the sign for the event is outdated.