Damn that Ford for diluting the brand and branching out from the model T.
Porsche has well proven where the direction of the company goes when remaining "pure", whatever "pure" means. Lest we remember the dilution of the brand with the lowly 914, or heaven forbid we make any mention of how the 924/944 series saved the company from absorption at best, extinction at worst. The simple fact is that Porsche is the sole remaining independent sportscar manufacturer. Ferrari cannot claim that, Lamborghini cannot claim that, Bently, Aston Martin, nor Audi can claim that.
I would rather see Porsche owning VAG rather than a VAG, GM, Ford (take your pick) owning Porsche. If that can only be accomplished through the diversification of the brand through Cayenne or Panamera sales, then so bit it. I would rather see Porsche put more cars on the road that see Porsche used to put more Fords on the road.
Liken this to the Apple fans who were dismayed when the Mac was released...or the Mac fans who were dismayed when the iPod or the iPhone were released. Surely these all help to spread the product offering.
Many choose, pessimistically, to name this a dilution of the brand. I prefer to be more optimistic and call this a diversification of the brand. If this allow more models like the GT3, GT2, etc., then by all means Porsche, keep at it.