Ron Wallace teaches that salvation will still be available after the rapture to anyone who has not taken the mark of the beast.

There needs to be Jew and Gentile believers alive on the earth after Armageddon in order to populate the earthly Davidic kingdom. The everlasting gospel will be proclaimed by the Two Witnesses and the 144 Jewish servants of God, exhorting all to reverence God, give Him glory and worship Him who created all things.