At the end of the day Apple wants to sell product. It's harder to sell stuff that's outdated. I don't think there's anyone inside Apple advocating for a delay in introducing new Macs.
But some of the products in the lineup are really old, someone has decided there is no rush to upgrade them.
Anyway Phil is doing a great job as head of marketing (they even gave him responsibility on the App store), that's what my post was all about.