Why does every product manager, marketroid and sales person think..
that their premium product will maintain market dominance, it won't. History tells us that high-end products set expectations by showing what is possible. However, if there is a real market the 'discounters' will spot an opportunity and get in, creating 'good enough' products to satisfy demand and create funds to iteratively improve and so sell enhanced replacement products.
The question is therefore, is this really a "clearance sale" or the first signs of Apple cannibalising it's own base.