TX is getting an influx of dentists from out of state but I think the conditions will hold up for a while. You just have to use common sense--don't practice in the heart of the metro parts of big cities, look for areas that are heavily residential and with a good pop to doc ratio, etc. many people just want to march into an area with many dentists already (CA and NYC being the worst examples) and expect to do well ignoring the fundamental effects of supply and demand--that will almost certainly lead to failure (and no, being 'good' does not necessarily mean you can negate the saturation). I just bought an office about 50 min away from downtown metro that is surrounded by residential districts (mostly houses and not apts, so it's people who will be here long-term), has a doc to pop ratio of 9000:1. I live in the metro and just drive out to work. I feel that this is a favorable setup and there would be no way in hell I would have bought an office downtown and have the same confidence.
The good thing about TX is that it's economy is strong. Oil and gas creates a lot of jobs and ExxonMobil is just about to move its World HQ to about 3 mi away from my office with tens of thousands of employees and their families. There is no state income tax precisely because of this strong economy. Sales tax and cost of living is low as well.
Then again, none of this matters to 90% here of the dentists (present and future) who just want to be in NY or CA like moths to a flame. I certainly don't mind in their helping to keep this a secret.
In my view, dentaltown is full of immature whinies. Yes, dentistry is tough work both physically and mentally, but it is also the one who got them the nice houses, cars, and bank accounts. There is a plethora of jobs out there who can do worse--a lot worse. So a lot of them should grow a pair, let them drop, and be a real man about it. Firm is right about the trend--at the current rate, pretty soon the costs/benefit of being a dentist will be outweighed to the former, but for the ones who are already in it or can do so cheaply (comparatively) at state schools, enjoy the ride. Work hard, use common sense about where you will work, and you will do well. On, and don't work for bloodsucking corporations--you will be treated like **** and you will never realize more than 1/3 of your ceiling.