If you are wondering if being a physician is finally a saturated market, the answer is an astounding no*. The asterisk is because it really depends on the field you enter. Primary care is still desperately short, both in rural areas and particularly in dense cities. In New York, for instance, it will be easier and more timely to schedule an appointment with a specialist than with a PCP. Primary care is where the massive physician shortage lies in the United States. Whereas with things like RadOnc, graduating students viewed it for over a decade as a 'cush' 9-5 type job with $250K+ prospects that just couldn't be passed up. Now the market is absolutely saturated (not just in that specialty, but in quite a few of the lifestyle and/or 'prestigious' specialties).
Medicine as a whole is not on the decline, however certain aspects of the field of medicine are becoming less and less worthwhile. I think we could probably blame students choosing specialties instead of PCP on the ever growing rise of midlevel providers. The area we need more care is PCP, but physicians as a whole stabbed themselves in the foot by NOT entering primary care in the numbers needed. Now, we have a field where primary care demands all time low wages because, in the sea of lacking physicians, administrators realized they could hire PAs and NPs for a lower price to 'do the same job,' and physicians in turn have over-saturated the market with specialists making many specialties have poor job prospects.
Overall, regardless of the field you choose, the unemployment rate for board certified physicians will never go above 1% because an MD in any specialty will always be in demand somewhere. However, the dream of graduating medical school, starting a practice and being independent of 'the system' is virtually dead. However, there is a growing trend of in-home physicians, telemedicine etc. so, you really never know.