Oh yeah. I made another level about a month ago; The Doors of Koopa Hotel.
Still only three people that actually played it after all this time, with two of them on the very first day, and no completions. Since the four levels I made before this new one (all now around a year old) have also seen a pretty mediocre amount of activity, I'm pretty sure at least the online aspect of Mario Maker has been pretty much dead for a while now.