I'm not arguing its a solution, but all I am pointing out is that many of the folks who buy that type of a machine are unhappy with Apple's direction. I think we can get bogged down on what's better (internal vs. external) which happens quite often in the Mac Pro forum, but my point was the choices that Apple made were counter to what people wanted and that in of itself had effected sales.
There is no doubt that you have a point there, but then again, is there any data to back up what you claim? Sure, some people on the forums complain. But I do not think that you can project these complains onto the entire customer base. It has often been pointed out that people are more likely to raise their voice if they are unhappy about something. There are certainly people who are less happy with the new Mac Pro. There are also people who are very happy with the new Mac Pro (for instance, we have bought 5 of them and we MUCH prefer them to the old box). In the end, if you want to talk about sales performance, you need to have some sales indicators (direct or indirect) to go by.