Chris

Given that you're trying to draw him out on statements he made almost five months ago, I hardly think you can expect him to continue the discussion now, unless he wants to/can be bothered. So no, don't hold your breath - and don't assume, if he doesn't reply, that it has anything at all to do with your perception of the strength of his argument.

I'd also be a tad careful about making grandiose claims like 'I completely understand your statement'. It merely puts you at risk of looking ridiculous.

I've read Pierre's statement several times and I believe it could mean several different things, conditional on what he thinks Doctor Who is and what he thinks it should be (points he hasn't elaborated on in this thread so far as I can see).

Audience and demographics are but two considerations and for you to grab on to those at the exclusion of any other possibility is not complete understanding, it's just a great big blinkered presumption.