Well that us easy, the ability to legally fly without an electrical/battery
system might be taken away.
The whole point is for the FAA to look at what is needed to allow drone
flight and you may well see requirements for all flights to be ADS-B
data-out (or even data-in equipped), which may or may not also include
transponder capabilities (it may also be possible to do 1090ES data-out
without being a full transponder). Its certainly possible to power modern
transponders and/or ADS-B data-out or data-in electronics from modern (or
even old) battery technology.
For many reasons the drone stuff in this bill is a major worry for GA and
sports aviation... AOPA and EAA etc. need to be all over this,
unfortunately their effectiveness in helping moderate ADS-B related
silliness in the past has not been that great.
Darryl