This is applicable to all jobs. Vote kicking people from dungeons is not a BLU-only thing and neither is it bad. There is absolutely nothing wrong with kicking someone who does not even bother to do the job quests (or in case of BLU, get their spells). All of the spells outside of primal spells are easy to get, and drop rates can be adjusted. No one is strong arming SE to keeping primal skill drops at 5%. They could just as easily make it 50% or 100% like they did with Mind Blast and Glower if they do not want BLUs to be stonewalled by DF/PF.
It could be something as simple as a quest that checks to see if you have x, y, and z skills. If not, you don't finish the quest. The reward from the quest is being able to progress freely in DF and higher levels. Besides, they did it for Shield Lob/Tomahawk and the Hall of the Novice, they can do it for BLU skills.
The current system is a piss poor way of trying to police the community instead of letting them police themselves.