So WHERE DOES THE P13 FIT ? I fear the p13 will be the straw that brakes the camels back .
I would think there should be plenty of room for the P13 to slot in below the 12c and still be a competitive offering. Both the 12c and the 911 Turbo S are going to fly around tracks, cause back injuries when accelerating, and both will hopefully be enjoyed by their owners as wonderful drivers' cars for commuting to work, tearing up country roads, and going like hell when the mood strikes.
All that said, it would seem saying there's no market for a P13 is sort of like saying there's no market for any 911 outside of a turbo S. A Carrera S will do everything a Turbo S will do dialed up to 8.5 instead of 9.5, and the Carrera S is the best selling flavor of 911. If a P13 is an 8.7 vs. 9.7 (love Porsche, but want to play for team McLaren

) of the 12c, I think there will be a market and demand.
If the expectation is that a P13 is to play ball against a Carrera S / 4S, and not the Turbo S when it comes to calculating 0-60 and lap times, I think McLaren can beat that benchmark without cannibalizing the 12c market. As with all things, particularly things with six figure price tags, the success of the P13 will likely come down to how much McLaren lists it for... If it comes in with Carrera S beating stats, but a Turbo S price tag, there will be a problem.
From reading this forum, McLaren has shown that they are listening and responding to their customers, which should mean they are paying close attention to their market. I'm sure they learned many lessons on what they did right, and what they can improve upon after having the 12c out for a few years. I have faith they'll get it right, as a hopeful buyer, I truly want them to!
-nh4.