Agreed. This is the pinnacle of PC spell power. The spell says "...can even provide a new body if the original no longer exists, in which case you must speak the creature's name." [emphasis mine]
If the barbarian player was role-playing his character accordingly with the aforementioned head long charge, then I would rule that upon casting the spell, and speaking the barbarian's name, the original body disintegrates, and the barbarian "...then appears in an unoccupied space you choose within 10 feet of you."
That is how I would rule it, or even leave the body, it just now has no soul to match it (no raise dead or speak with dead, etc.), especially since True Ressurection is a level nine, and those spells are supposed to do truly reality warping things.