My observation would be yes. Based on the two clubs I fly at, anyway.
My own hanger has three glow models (and a fourth .40 size engine still in the box) vs. three giant-scale gasoline powered and fourteen electric powered (from micro to giant scale). I don't imagine I'll ever again buy a glow-fuel powered engine. Too expensive to feed. I'll probably keep the four glow engines I currently have in something until they give out or take that final dirt nap.