To quote fight club
A new car built by my company leaves somewhere traveling at 60 mph. The rear differential locks up. The car crashes and burns with everyone trapped inside. Now, should we initiate a recall? Take the number of vehicles in the field, A, multiply by the probable rate of failure, B, multiply by the average out-of-court settlement, C. A times B times C equals X. If X is less than the cost of a recall, we don't do one.

The sheer amount of money that would be spent in the dentistry industry to take people's amalgams off is too great. Plus the ripple effect it would cause to insurance companies and massive lawsuits.

The amount of people affected by amalgams is negligible. A lot more people would have to become symptomatic for huge changes to be made.
What will most likely happen is dentists will gradually move away from amalgams and try to keep it quiet until it is completely ruled out