You're mixing up frame interpolation and original 60FPS content. That's not the same thing at all.
By all means, keep indie and art house productions non-3D, 24fps and on celluloid. But for insane tripple a productions: higher frame rate pls.
Supposedly the Avatar sequels are gonna be in 48 or even 60. Maybe they‘ll act as a catalyst again, like the first one did for 3D.