I understand why they want Meteor/Ice Nova/Time Anomaly to be cast by all mages regardless of spec, they did say that they wanted mages to not feel like they were only playing just an Arcane Mage or just a Frost Mage, they wanted to make Mages feel like actual masters of all schools of magic weaving in different types of spells in their rotation.
Saying that, if they want to accomplish this, they need to make them impactful, otherwise its not worth taking.