One of the clubs that I belong to had an invite for a Fly-In last evening. Thus, my wife and I attended just to see what folks were flying indoors. Naturally it was all electric and even a manufacturer had a booth with charged models that anybody could demo.
But the one thing that I noticed mostly that even though all club members that were attending are primary airplane fliers, most all also had a " Drone / multi rotor " model with them. Most of them stated that they were stable and easy to fly indoors. You have to keep in mind that most of these folks are die hard RC model airplane builders and fliers. But for indoors they wanted something just to have a little fun with.
Guess we can see where the Drone trend is taking us.
P.S. Even my wife mentioned that she would like to have one.