"Wireless power transmission" will never safely work at a distance of more than a few inches. Look up "inverse square law."
Nikola died alone and pennyless because he spent his fortune trying to make it work. He and Edison got very wealthy because they were completely obsessed with their ideas. Edison went bankrupt twice because of his obsessions, but got rich three times. After becoming very wealthy once, Tesla then went bankrupt. He probably had lots of more great ideas but did not pursue them due to his obsession with wireless power transmission.
Edison had a few great inventions which made him enough money to then invent the "invention factory." He was obsessed with DC power transmission and whether he was just too stubborn to listen to the experts, or maybe his hatred of Tesla, he refused to accept the idea of AC power.
Tesla was backed by Westinghouse (who invented "air brakes" for trains) to bring multiphase power transmission to the world. Except for extremely high voltage transmission lines, power transmission of any significant distance is in almost every case delivered by AC.
Yes, wireless power transmission can work, but not safely. You have to use microwavelengths. You can tear open your microwave oven and use that kilowatt to power your small RC truck if you can keep the transmitting and receiving antennas pointed at each other. Before you try this be sure to make out a final will and testament, or at least get very good health insurance.
RFID is actually wireless power transmission. The RFID reader transmits power and the ID tag can grab enough power to run the "chip" that modulates the antenna impedance enough for the RFID reader to decode the field modulation. 125 kHz RFID is called "contact readers" like your ID/access badge to get into the office, you put your access card right up against the RFID reader. A lot of toys use 13.56 MHz RFID and those work quite reliably to a distance of many inches. 915 MHz (868 MHz in europe) can do this up to 3 meters. The RF field of the 915 MHz systems leaving the antenna is 4 watt ERP which is enough that a few microwatt can be collected by the RFID tag to run the 'chip.'