There will be those that don’t change their practice ever once they graduate (seen a few).
Things get more complex when you have dozens of treatments for a condition with no clear winner.
Before I got in the industry I thought “what the hell does marketing do?”. Then once I saw what they do, I realized, no, most drugs don’t sell themselves, there is too much inertia for doing the same old thing.
If you develop yet another blood pressure drug or cholesterol drug and want GPs to prescribe it, you're going to have an uphill battle.
A blockbuster drug for HepC (where treatments before weren't particularly effective and had ugly side effects) will have a much easier time becoming well known amongst the specialists that treat the disease.
The government isn’t going to get away with hiring entire teams based on looks and then have a marketing line item for free fancy lunches for people that are definitely not starving.
Choosing Wisely is a broad approach that is somewhat like you described.