Not trying to provoke a debate. Medicine/ health care is a business. A business that has certain fixed and variable costs. These costs must be met in order to stay in business. If an income stream is taken away from a business then either the costs need to be cut/ eliminated or the income stream has to be replaced.
Yes there are MDs that would like to give up defensive medicine, but those that are in private practice or independent LLC's wouldn't like to give up a significant portion of their income.
To the OP, explore states that have passed tort reform laws and see if it has had a significant decrease in costs, improved quality or access. An area that wasn't relatively apparent in your foot notes.
There is the possibility that tort reform could have positive effect of lowering costs, but it is only a possibility. A lot of other factors have to fall into place for that potential to be realized. As an example, after tort reform, would insurance companies fully reduce mal practice premiums in order for MD's to have a cost reduction or would they try and maintain the premiums as high as possible thus maintaining their profits for the share holders? To over simplify, one business cost is another business' income or an employee salary.
This is a very complex area with many variables, many varied opinions and no single correct answer.