All 3 of your points lack supporting data.
For 1 & 2 specifically; Doctors receive an itemized DEA report each month for each patient who's prescribed controlled substances. The reports contain all controlled meds prescribed to that patient, from every Dr.
I saw my first DEA report 20-odd years ago, so they're nothing new. Each report is a tap on the shoulder to remind Dr.s that every controlled prescription they write is being closely monitored. Patients are monitored exactly as closely as Dr.s, they just aren't informed every month.
So - the volume of prescriptions inferred by #1 & #2, would immediately attract DEA attention. Both Dr and patient would be in cuffs before drug-seeking patterns had time to develop.
What is entirely more likely than 1&2, is that the endless demonization of prescribing opioids - and the continual LEO threats against Dr's who prescribe meds in a way that the DEA doesn't like - is increasingly frightening Dr.s away from treating pain in an effective way.
Your #3 contains a number of assertions that would be difficult-to-impossible to prove (or disprove), when strung together like that.