I'm skeptical of this. So long as aggregate MCAT scores are still used to rank schools, and so long as admissions staff see the MCAT as an important, quantitative, standardized stratifier of applicants, there will be significant pressure and incentive to try to maximize MCAT scores. Top schools don't want "central tendency", they want "leaders" who can exemplify themselves academically as well as personally and professionally.
I share your frustration, but, much like Step1, SAT, GRE, and every other standardized exam, it is too easy a tool to interpret "bigger is better". I do not anticipate meaningful change unless scores are reported in a meaningfully different way. Changing the number scale is not, in my opinion, sufficiently meaningful. Reporting applicants in "clusters" (for example those with "highest performance", "high performance", "sufficient performance", "questionable performance", "inadequate performance", "woeful performance", etc) that prevent the sort of hair-splitting admissions staff are prone to would be a great but pie-in-the-sky adjustment.