“Why would you voluntarily make your daily life actually unpleasant just to increase an already high income that you’ll probably have less time to enjoy anyway?”
IIRC, dentists have some of the highest rates of depression and suicide of any profession. As for if this means things could only get better under a new business model, increased earnings would translate to earlier retirements (and by extension lower supply of labor), or if dentists would prefer to keep their current earnings over trying a potentially more intensive job, I can’t say.
The possibility of sudden spikes in prices during a crisis also incentivize “speculators” to stockpile the good in advance. If they buy during normalcy in anticipation of a crisis, they smooth out the price curve by raising the price before the crisis has hit. As they hold the inventory in the mean time, these speculators are effectively creating a buffer in a potentially otherwise just-in-time supply chain.