Maybe I'm in the minority, but I think if we take this idea and walk with it, it has the potential to trivialize actual accomplishment. Maybe I'm overthinking it.
We're not going to see The Running Man style/quality fake videos any time soon, and the media kinda runs with this an exaggerates; making people wonder if camera footage may one day no longer be considered evidence.
We're far from that. At the most, the quality of the transfers here is about the same as what you'd see with Deep Fakes (celebrities imposed on top of pornographic models using computer vision and AI algorithms).
But, with that said, this work is dependent on having a "source" that the user is using as an input for pose detection. The actual accomplishment must still be performed and recorded, though I suppose this opens the door to the dance equivalent of "lip syncing" even beyond what might be done today with a body double.
They said the same thing with any new artistic medium. Digital cameras, photoshop, Instagram filters, MIDI music instruments, etc.