I will tell you something else though. It is my wife's car which has this problem, she dropped it off, I told her I would pick it up because I was thinking about upgrading my P85DL to a Raven P100DL. However, after sitting there waiting to pick up the car, listening to other folks and their frustrations with issues like non-reproducible errors and getting charged for diagnostics (to be fair, service waved them but explained to the customer if he brings it back again and they can't repro what I understood to be A/C failing, they will have to charge him 2 hrs shop time), it cured me. It really made me think - my P85DL is in good shape, little battery degradation, MCU getting slow but the new one has got issues too (my wife's car has MCU2).
Getting a new Tesla is just rolling the dice to potentially have more issues to deal with in exchange for a quieter car with some extra power (P85DL is not slow by any means, even though it doesn't produce the originally advertised power). Even if I have to replace the MCU on the old car at some point, it's still better than chancing it with a brand new Tesla. The "evil you know" I guess?