Here's one thing that could set live MUSIC performances apart from anything that could ever be shown/HEARD on the screen. Have live performance done completely acoustically. No microphones. 

Folks have forgotten how much better acoustic instruments SOUND when un-amplified. They never hear them (unless they are a musician) because at home even acoustic instruments are always heard through a sound system, earbuds, headphones... of varying quality.

When I play salon (home) concerts) on a Steinway 'B' (unmiked), acoustic bass (no amp), drums, sax/trumpet, the dynamic range is huge. The sound is UN COLOURED by any technology, the band balances itself and the audience is drawn in, in a way that leaves them awe struck. The say they never experienced music like that... ever.
Sadly, most people have never heard music where the energy of the sound itself is produced SOLELY by the calories burned by the musicians.
If the power fails, we still can make impactful, beautiful engaging music.