“Does gesture control really have a place in digital signage, or is it a flash-in-the-pan trend?”
I don’t see gesture control as a flash-in-the-pan at all. The fact that gestures are used almost universally on all smartphones means that the masses can share equal access, and it means that there is no language or cultural barriers to get in the way as there might be with voice-activated technologies.
Pointing was likely one of mankind’s earliest communication tactics, and screen gestures are a natural extension. Children very quickly adapt to gesture control as well. They often pick up on games without any training simply by intuitively observing the screen feedback after touching or attempting to control objects on the screen. Verdict: Gesture control is here to stay.