As and endgame ship it will be very powerful in the hands of even a mediocre vasari player using phase nodes.
Yes, the Kostura and Marauder, iirc, can make delivery a bitch.
As a Vasari player, I'm hoping one of the abilities on the Vasari Imperial Titan (loyal) is the ability to turn planets from terran or ice to Volcano planets (while bombarding) Cause we like it best when the action is hot and heavy. We're here to heat you up!
Unless they modify it (and I don't see it happening), there is no ability for a planet to change types once in gameplay. So, I doubt this will happen. Besides, unless the others get some equal benefit, this doesn't really do anything to balance out gameplay.