121.5 should be for genuine Emergency use only, forget all this .....practice......crap. If its deemed so important, give them a practice frequency.
So how do we tackle the 75% of wasted air time made by commercial pilots then ?? No point tackling the small percentage of practice calls (1% of the air time) when there is a HUGE problem which would have a lot more benefit overall if addressed and solved.
The 'little guys' ain't the problem really .... the professional industry needs to look in its own backyard first and tackle its own thorny issue before it starts pontificating.