I don't think so. I believe that new product introductions for the Zetec cars may slow down, but there are some companies that have not been able to design and manufacture parts for this application because they do not have the resources to do so immediately.
Also, look for improved versions of existing parts. As the Focus gets older, there will be more enthusiasts willing to modify their cars much more so because they are out of warranty. This will bring about more "hard core" parts such as pistons, rods, cranks, clutches, camshafts, etc. I am sure that more forced induction kits will come to market as well.
When more of the 2.3 duratec cars hit the market, there will probably be a surge of new parts available for it. Just look at what FocusSport and Focus Central are working on. I am sure there are many other companies "tooling up" as well. I hope this helps.