It is already common and has been for years. All you have to do is walk into any nursing home and see that everyone is drugged to the gills so that they don't give the workers there any trouble. Having worked in a nursing home in the sixties, I can tell you nothing has changed which is why my parents didn't go to one.
I know. I also know that an untold number of deaths in nursing homes and hospitals occur when a dosage of pain-killer is 'accidently' (wink,wink,nudge,nudge) given after a private talk a family member will have with a care-giver.