If your wife loves the mustang, you’re the one have to choose between Miata and M3 then. If you love the EV side of your M3, I would say go for the Y. It’s just a bigger M3 with more room. Otherwise, the minivan is a good choice. It is real versatile as a family car.
BTW, how do you like the handling of M3, compared with Miata? I always want to get a Miata. Sadly, they don’t have it in China now. Otherwise, it would be my first choice.
It's hard to compare the Model 3 and the Miata (which is a 2002 model year, they are cheap and easy to find still). The Miata is very small by the standards of the USA car market. The nice thing about the Model 3 is that the weight is down low. I had a Challenger with a 5.7 liter and a manual transmission which weighed about the same as my Model 3, but all the weight was in the front under the hood. The Model 3 drives like a car that weights 500 kilograms less than its actual weight.
The Pacifica PHEV drives like a really boring hybrid, like a Prius, which isn't surprising because it's basic design is similar to what a Prius uses with the power split planetary gear transaxle. Also the front wheel drive is bad for torque steer and wheelspin, even on dry pavement. The new AWD models are much better driving, but now you've got a car with much worse efficiency.
I've spent a significant amount of time in a Model Y (performance model). It's not quite as spacious and practical as a minivan but it's probably close enough. It does still handle much better than a minivan. I do miss having Apple Carplay (especially wireless version that's now available in the Pacifica and a few other models) for the app integration. Tesla's navigation, voice commands, and sound system on the long range cars are really good. However they just can't fully have the functionality of Apple Carplay/Android auto, because Apple and Google make so many apps work with the car.
I don't have the option of changing cars until I finish closing on my house in a couple weeks, so I'm still gathering opinions and information.