Here's one from a part-timer with a CPL no IR without ANY wish to give up the day job for an airline (not necessarily me):
Those who have spent the money on getting the required min. quals. (FI + BCPL then CPL theory) will obviously be miffed at having others alongside with lesser "investment".
In addition, I can see that FTOs will just use this as an excellent opportunity to jettison the CPL/FI types and STILL charge the same for instruction, using PPL/NPPL instructors.
I do agree that a Class 1 for PPL/NPPL instructing is onerous.