RC:

I think Porsche doesn't see the market here but looking at how many GLC 63 S AMG people have already ordered blindly (my sales guy says he has no more GLC 63 production slots for 2018, also because Mercedes has delayed the introduction to spring 2018), I think Porsche is missing an opportunity here.

 

I think Porsche know that, but their own product hierachy is more important to them. I will not say say don't care about competitors, but it is not a primary goal. Where for example BMW and Audi look very close to each other.
Porsche want to protect the Cayenne like they protect the 911. A V8 Macan is too "good", like a 6 cylinder Cayman/Boxster is too good.
Look to the Boxster/Cayman in the past, always somewhat disappointing, espacially on engines. But with the 4 pott 718 they overdo it. Disapointing sales numbers. Good job....
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daily (no fun): BMW 430d
for fun: Porsche Boxster GTS