You are right, but this is the past, the future could be different.
At the moment they are very successful.

The biggest problem will be the 718 in my view.
From performance view the 991.2 is good enough for the future, but the 911 design (inside and outside) get more and more boring.

Look at 2015 225k cars at all, only 55k are sport cars.
Younger people think about Porsche as a luxury SUV car company which also sells some sport cars.

They may lose more and more ground concerning sport cars in the future, thats what I meant. I did not wrote it properly in my last post.
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daily: BMW 430d
for fun: Porsche Boxster GTS