I predict,that the LSAT scores will become more stratified - more divided into two distinct groupings, in a way that will be very helpful for LSAT-obsessed people like us.
Once word gets out that "only the highest score counts", a whole new wave of test-takers will appear: People who take the test with little or no preparation "just to see what they get". I have to admit, I was nearly one of these people. Long ago, I signed up with LSAC, and nearly sent in my fee, thinking, "I'm smart - I can do this." Until I picked up a practice test... Under the new rule, though, I might have still gone ahead and taken the test.
The result: The number and distribution of scores in the 164+ range will stay relatively unchanged. These are the people represented by us - the people who take this seriously, who are going about the process as if it's an important life changing event. (Which we all know it is.

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But there will be an influx of scores recorded at the < 160 level, from this new wave of "try and see" test-takers. And this will only help out the curve for us.
The only question is,Will word get out in time? Will there be a massive influx of unprepared test-takers in September? Time will tell.