That sounds okay. My problem with this sort of thing though is that it should always have a bigger impact than being a cool thing to pull out at parties / dramatic escapes. If someone found a way to make wagons fly, you can bet people would start researching that.
Apparently Dalish already do it all the time...?
But I guess this was a reveal how they got around. The character I mentioned wasn't Dalish herself, but she got the idea just from observing them. The story is about the last blight, and she thought it'd be a good way to evacuate people in large numbers.
As for research... the main problem is probably the duration. One cool thing about the book is it gets in the mind of a mage. She's constantly warding off the fade spirits/demons. Sustaining spells like that are dangerous and distracting.