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It is being discussed primarily because the same situation is going to arise again. The official line is no , but that was said before was it not?
Again cost is the defining factor, and especially it's pricing on the market.

One thing has changed though.
The original Z4,Z4M and Coupe were brought in to support sales of the E85 Z4which was a radical car at the time, especially with it's cutting edge design.
The new Z4 (E89) has proved to be a success and have a much better response than the E85.

When you look at the 1M and it's unique skunkworks development and especially the engine. The car is handicapped because of the M3 and the desire to not let the car get within the distance of the M3 is evident.
Afterall they do not want to kill the golden goose (yet).

Should they consider a Z4M , then with the phase out of the 1M and the M3 with it's V8 you could see the "less restricted" output out of the 1M engine to even the balance.

As for a Coupe? When both hardtop and soft-top were being considered for the Z4 an additional Coupe was considered also. Until the two collided and introduced the folding hardtop.
A potential Coupe could return to the similar character of an E86 or it could simply use the fixed roof from the GT3 car , it all depends on how adventurous the programme gets.

Looking at past history and especially jumping a couple of years into the future. You can see how the opening for such a model is there.

Acknowledgement to benny @ Bimmertoday.de.