“When wireless is perfectly applied...”
One thing to note, Tesla wasn’t just speaking of wireless transmission, as they already had the basics of radio pretty well understood in his day. What he really was referring to was wireless transmission of electricity, which was a pet project of his. Basically, he imagined the kind of world we have today, but with devices that would never need to be recharged, as they would charge themselves from the surroundings with an antenna.
I still believe he figured out how to tap a resonance of the Earths magnetic field to generate electricity.