Brand management and brand loyalty will dictate a lot of this. I for one would not be opposed to having a Mercedes in the garage. But for now the idea of a weekender or sports car is Porsche not Merc.
Mercedes does plenty of things well but the look, feel, appeal, and desire for a Porsche is not something easily taken away.
If Porsche ends up with some ugly/poor performing cars then other companies may catch them (if only during for that generation) so far though they've been doing it right again and again..... and again.
I hope to be back in a 911 soon myself
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2017 R8 V10 Plus, 2016 Boxster GTS, 2015 Macan S, 2015 V12 Vantage S - Pending Sale, 2013 911 C4S - Sold, 2012 V8 Vantage S - Sold, 2013 DB9 - Sold, 2011 997.2 Targa 4s - Sold, 2011 E90 335i M-Sport - Sold, 2013 981 Boxster S - Sold, 2006 E46 M3 - Sold, 2010 E60 M5 - Sold, 2006 E46 M3 - Sold, 2011.5 E90 M3 - Sold, 2006 325i - Sold, 2004 Mazda6 - Sold