Or just sell it while used market is hot
Still not worth it. As raphy3 said, I'd still need to replace the vehicle(s). Sure I could go down to a 3 or y, but those are too much of a sacrifice. This is the wrong place to nit pick the differences, but they are too great.
I'm also grandfathered in for premium data on both vehicles, already upgraded both to MCU2, so got a lot of the add-ons there. I'm grandfathered in for unlimited supercharging for the life of the vehicle. I drive 45k/year, so that supercharging alone makes it worth while. Seems my 90d MS's battery has leveled off with degradation for now, at 248 miles per charge and a pack capacity of 73kWh. So as long as I can live with that range, I'm "OK". 3-4 years ago, I don't think I could live with that range, but with so many superchargers now, it's not so bad. My first MS was a MS60, with a 100% charge at new of 209.
My MX75D range is now about 209 at 100% charge with a pack capacity of about 65kWh. Where as I can nail the range spot on with the MS, the MX, I'm LUCKY to get 75% of the rated range in the summer and difficult to hit 50% rated range in the winter unless I kill the heat. The MX is mostly used as an in-town vehicle. We use the MS for longer drives, Milwaukee to Chitcago, or other long distance depending on what I need to get done, the MX is great around town car and 7 passenger when the In-Laws visit (for 6 months at a crack!)