The faster charging in the future will likely do so with higher voltage which means cable size does not need to increase
How much higher, cause over 600 volts, the rules for effing around with it start to get "serious".
High Voltage Electrical Safety Bulletin
High Voltage Electrical Safety - Working on high voltage systems — systems greater than 600 volts — must be performed using de-energized electrical safety work practices, whenever possible.
www.electrical-safety-forum.com