Exactly, although you'll be hard pushed to find one that does everything as well as a C2S sadly (R8 is too slow and has no storage, Aston is too slow and too fragile, and what else is there brand-new for £100k?) so it's still going to sell like hotcakes.
I agree and I suppose if you're in the market for brand new then it makes sense. Out of all the cars you list above I would rather have the Porsche, it is essentially unrivaled as an all rounder in that price bracket. It's only when you cast your eye to the second hand market do the possibilities become apparent and in that market there's a lot to be had around 100k.