The long term trends make it almost inevitable that we will see massive tax hikes on the 'rich' in the future, and that people like doctors will be hardest hit.
1) Demographics: immigration and generally dysgenic breeding patterns mean that the share of the population for whom "higher taxes" simply means "more handouts from the government for me!" is growing ever larger. We will eventually get to a point where the number of people who suck from the system is greater than the number of mugs who put into it. Obviously, if you suck from the system, you will want as much money to be flowing into that system as possible, and anyway, "check yo privilege" right?
2) The US has been increasing the debt/GDP ratio for the past couple of decades. It has been doing so even though the financial tsunami caused by baby boomer retirement hasn't hit yet. Even under the current rate that is not sustainable, but that rate will soon accelerate. Taxes will eventually follow, else we will go bankrupt, or should I say go bankrupt sooner. (if you think spending will be cut rather than taxes going up see #1 above)
3) The rich will not be hit. The "rich" will. Sadly, doctors fall in that latter category. An ortho working 80/hrs week to pull in 700k is not rich. He doesn't fly to Davos or have any pull whatsoever with Congressmen or senators, nor does he shape public opinion through the media. The actual rich do all those things, and as a result they are never the target for real haircuts. The "rich" doctor, or anyone who earns a high income really, is the perfect target. He's high enough above the general masses to satisfy their thirst for blood, while not so high that he can insulate his money from attack the way the truly rich can. By throwing him to the wolves, they truly rich can also divert attention from themselves. That whole "top 1%" thing is a perfect ploy. Yes, 3 million people in the country are all engaged in a conspiracy to pauperize the nation. Lloyd Blankfein of Goldman Sachs sits next to your urologist and car wash owner at "1% meetings" and discusses the best way to control the British pound
Anyway, rant over. Point is, don't expect the tax situation for doctors to be very rosy.