This is what I would do and make!
Z-car lineup is almost empty. I would add 3 sporty cars so that BMW would not loose all their hard earned sporty reputation when launching future FWD cars, and making bigger and duller cars in general.
, rwd convertible and coupe.The premium MX5 with several engine options and the featherweight version of the Z4. (Could share many parts with the Z2) Under 1050kg with many options. 3-cylinder engines. This car should be tiny and RWD.
Sporty 2+2 hatchback style «coupe» with a tiny trunk and 2 doors.
Why the tiny trunk? Because normal people should be able to sit in the back. You could fold down the back seats if you wanted more space in the trunk. The BMW design would be inspired by the old Z3/Z4 Coupes,Ferrari FF and the GT86 hatchback render i have posted beneth here.
1210kg-1300kg, depending on engine and options. Good option of 3-cylinder 1,5L engines only. 110hp-220hp in normal versions.
Extra powerful and rev happy M-version with 270HP and forged internals.
«Stripped out» CSL version with 280+ HP and below 1200kg.
Sport seats standard. Lightweight supersports seats as an option (from the CSL version)
"SuperSport" brakes as an option on low powered cars (brakes from M/CSL version)
(Picture is fan-art)
Like today – Luxury GT Convertible
«Sporty «Supra style car.» (Collaboration with Toyota, there are rumors about this)
Maybe with a targa roof? 2+2, triturbo straight six.
1-series F20/F20 facelift
With some of the same design as the 2-series GC render. Continue with hatcback and not mess up the 1-series..
-Torsen or cluch-pack LSD as an option for all vehicles!
(and the ability disable E-diff)
-Sensitive hydraulic steering as an option when chosing M-package. (if easily possible)
-Sensitive hydraulic steering standard in all Z and (non X) M vehicles.
-Manual transmission as an option for all vehicles!
-Good looking Alcantara sport seats as an option for all vehicles.
-More wheel and tire options.
New «X-drive SPORT» AWD system
Adjustable center-diff from the iDrive meny,70:30 to 10:90 ratio (front:rear).
4 present modes where active dampers are optimized to the drivetrain ratio for best possible handling.
1- Permanent front bias of 70:30
2 -Normal X-drive (default setting)
3- Permanent rear bias of 30-70
4- Permanent rear bias of 15-85
(Options to combine with mechanical LSDs)
That should make make some Audi fans get wet in their mouth, but also be an attractive options for typical BMW enthusiasts.