Fair point. All that I will say is this: Can I make a perfectly fine video topping out at 60fps? Sure, absolutely, I do it right now. Would I love 120fps to have more options on the editing board, hell yes! Will it decide on whether I want to upgrade to the new new canon or a different brand, for sure. I'm seriously weighing all of my options right now.
And maybe it's niche to you, but more and more people are getting into video, the niche of niche as was called is getting smaller and smaller. Personally I do photos + video. So being able to have all in one package is really important to me. I already have 2 pelicans worth of gear, not including light stands and whatnot that I have outside of my pelicans. So consolidating a video camera AND stills camera in one box is really important to me. The less stuff I have to carry the better, and thus I want the best bang for the buck in both worlds.
I don't think that's too much to ask.