Ice storm destroying a firewall. Cyclonic blast destroying just about any persistent AoEs. Is there any use to this?
In my opinion, no.
It is a griefing function that severely inhibits one caster's contribution to a party because of another's desired tactics. Furthermore it creates rifts between Savants because of the conflict in spell use. I, as an Air Savant, regularly use cyclonic blast against enemies that are immune to lightning, well if there's another Savant that likes to use persistent AoEs, I can't use this tactic now. Sure I can do other things, but why inhibit my abilities?
I'm fine with being able to use this against enemy spells and enemies being able to do the same, but there is no need for players using this against other players.
There is break enchantment if you want to intentionally remove spells, such as an overabundance of Dancing Balls or some such.