LEO has stated that they will respond to madd calls. you could be jacked up for 'suspicion' on their say so alone...
The reality is that this is not going to last. MADD will get a credit for a couple of high profile stops and then it will fade. It might be resurrected for New Years Eve etc, but that will be about it. Driving around looking for drunks is about as boring as it gets. Unpaid civilians doing it at their own expense will tire easily.
To address your other concern, remember that the LEO has to make is own observations. The phone report is not probable cause. Early on they may make stops anyway, but after a few invalid ones, that too will cease. A few complaints about meritless stops will hasten that. Nothing LEOs hate more than wasting time and uncessarily pissing off civilians.
This is more a tempest in a teaport looking for media coverage than a real issue.