One perspective
I find the experiment with Ptolus interesting, and important for the development of the industry and hobby.
I don't think this means that all products will be superexpensive in the future. It takes a lot of resources to create something like Shackled City (IMO a top tier product) or Ptolus (if the previews and info are to be believed). Not everyone has those resources, be they skill or money or distribution channels or what have you.
Therefore I think that we always will have low cost alternatives, like C&C, which caters to those who find the high cost items to expensive. If anything, the low cost items will have to really shine when rules and ideas are concerned, to pick up the fight with the flashier books.
Maybe the cheaper books can find an advantage in their format, with companies being able to respond faster to trends, and supply gamers with just the right content at the right time. I think this will become very important in the future, at least for the small publishers, who havn't got the clout to actually set the trends, as WotC and maybe even Malhavoc have.
So small and cheap books are already here, and will still be here tomorrow, and the format might even, if leveraged properly, be turned to an advantage when compared to the big books with high prices.
Now I want to see the huge and expensive books!
Cheers!
/M