Good news is that all the tooling and suppliers should be prepped and ready to go at Magna Steyr, with their modular assembly, and I'm massively oversimplifying... Welding a hard top to a Z4, adding nice Italian? leather, giving B58 a small performance tune, and putting some nice M logos on it...
Unfortunately, even if Munich allows this, I'm sure it'll cost a lot, and probably wouldn't see one in North America, because apparently, American consumers hate wagons.
Hi OP, congratulations on baby on the way! Won't rehash arguments other folks have made, here. There will always be more fun cars to buy, go with what meets your needs now. If that means selling ur Supra and get something more practical, I will back that play. Future will probably be a...
Sales is key, and missing out on public mandates means more barriers to entry = less sales. Mild hybrid, PHEV, or even full EV for next gen (at least) keeps Supra relevant for emissions requirements.
Edmunds and Caredge both have depreciation calculators, the depreciation curve on Edmunds is more steep. Fun to think about, but not rare enough to be an "investment car". Only really matters for the collectors or the flippers. Drive it, enjoy it, and live in the present otherwise.