Holliday,
Congrats on the new cars. I'm glad you and your wife are happy with the decision. I bet you'll miss the Z once in a while, but BMW's are really great cars.
Sometimes priorities change, and there's nothing wrong with that. Having a hot performance coupe vs. having a fun and practical 4-seater that both you and the wife can drive.
(of course, I'd have tried to talk her into learning manual, but that's just me
)