Years from now. a 1-series stripped to be a Trackcar would be a nice proposition. Turbocharge to 2.0 to 240 hp and well lightened. it will be great match for the M4 reputed to have a 2.4 litre S14 replacement pumping 240hp. As a small car on its own merit, I fail to see how it could hold out to the competition in the general public (within that class, of course).
The E90 320 is way better is almost all respects, except that its not a 1.