Thanks for the more detailed explanation of your thesis. It will be great to see statistics as we go as to what % of MS owners downgrade to M3. I surely don't know. I do know that its common that once you are exposed to $20+ bottles of wine, going back to what you felt was plenty tasty for $5 - 10 doesn't always satisfy. If resale value of MS stays high, it may not be the same level of economic stretch to stay with the S you've grown to love. Another unknown is what portion of the stretch buyers will be happy just driving their MS for eight, ten, etc. years before buying a new car.
Switching topics, do you or others suspect that the very recent release of HW and SW that has made 0 - 60 of MS 75s a full second faster,
may be a tip off that at end of month when all M3 mysteries are revealed, the 0 - 60 time Tesla has been saying we should expect will turn out to be .5 or .75 seconds faster? That and a slightly higher range would be awesome frosting on the cake. The kind Elon loves to dish out to poke nay sayers and shorts in the eye.