There already is a definition of what a model aircraft is - it must be remote controlled, flown within visible range, and for recreational or hobby purposes.
Most drones will fail this, employing cameras and GPS to allow flying outside visible range.
So no, RC planes, line controlled planes and kites are immune from FAAs interference[*], Most drones are not.
[*] Outside the 5 mile zone around airports - inside they have carte blanche and can say you can't play with lawn darts if they so choose.
While Drones may fail this, Multi rotor copters won't. Please quit combining the two.
"Irrigation of the land with sewater desalinated by fusion power is ancient. It's called 'rain'." -- Michael McClary, in alt.fusion