In this format? No. Pinpoint hand destruction is leaps and bounds stronger than Hymn against Flash, particularly when it costs 1 less and can net you the same kind of card advantage. It also has excellent synergy with a first turn Unmask. That it can be flashed back is just icing on the cake.
In a format where Flash isn't legal, Duress is subpar against Goblins, and Unmask is a questionable inclusion at all, so an argument could be made for Therapy in these slots for a Flashless metagame. We can wait until the first to discuss that.

