This may sound thick, but I am not too concerned with what happens after my institution. I want to get my shows up with the coolest look and the least pain possible. We are an ivy league prep. If one student goes onto other lighting control work later, they can adjust. I have been here 20 years and have about one new light tech per year - 20 people. Out of those 20, one has gone onto become a lighting designer. He could handle learning any board.
This is my opinon - don't get bent out of shape on this.
But - Your goal as an educator should NOT be just to create cool effects on the stage. Your goal should also be to give the students an experience that will benefit and prepare them for the rest of their lives. That is why they are in school - to prepare for a real life. If you loose that focus and become selfish, your students will also lose focus on what is important - their future.
Saying they can deal with it is an awful thing for a teacher to say. But, like I said, that's just my opinion. So what if you only have new lighting tech a year. So what if only one of them has become an LD. They are in school to learn info for their future. But what do I know? I'm only a college student studying to be a teacher, and I'm glad that my high school prepared me for my future as well as my four years in high school - a time which will only be 1/20th of my life (I hope...)
Currently, there is no Ion demo video on CB. ETC will be happy to set you up with a demo, though. (You could record it, and post a link here, though )