Demand for some segment (high end cash for combined treatment) continues to be strong. Low fee spots get filled first, and if you need to grow faster charge lower fees than market or open more sliding fee spots. If you have the ability to target the top quintile of the income I think you'll be fine. Nevertheless, in the best case scenario in the private cash market total net income > 500k probably doesn't happen until 5-10 years in. Exceptions do occur--there are people who buy out old practices and immediate get to revenue > 1M per year in the first couple of years out, but that's very rare. Good psychotherapy skills are very useful in this segment to engage new patients and retain old patients. People prefer combined treatment if they have the means and it's easy to see why.
Other people are making more $ managing midlevels or doing niche services (TMS/ketamine, etc). I'm gonna try to do some investigations in the next year or so on that stuff. I think TMS if proven somewhat efficacious will eventually take off, which would be a good thing as psych continues to transition towards some kind of outpatient, superspecialized cush procedurally oriented specialty like derm/opthal/allergy. Not sure about the various infusion/pschedelicy stuff--I do think they represent the future of the field, but unclear if they are truly monetizable in the next 10 years or so.
Insurance based psychotherapy practices have no future. They are already done pretty much. Most of my colleagues who work for a facility do 0% psychotherapy. Few even bill for add-on codes. Often facilities negotiate with payers such that MDs cannot bill for add ons.
Running insurance based med mgmt practices can be slower (see: sushiroll's pretty awesome thread) in generating net profit, but revenue will be faster and more steady, and you can probably secure more bank loans. This is an area I'm less familiar with but is the dominant paradigm. This segment will be much more driven by the regulatory environment and regionally specific, so harder to predict in terms of growth. Ironically, IMO high end cash will be similar model whether it's a wealthy suburb of Tuscon or middle of Fifth Avenue.