Is there a lithographic reduction available to create a superslim? Edit: Yes. PS4 Slim is on 16 nm. 7nm APU would get some saving. Not sure a super-slim is on the cards, but certainly a cost-reduced PS4 model is an option.
If there is an option on Sony producing a super-slim PS4 and gain a larger margin (more profit) on unit sales without a price-cut, you bets believe they would do so. But since we're heading into a new generation, more than likely Sony would opt for a $199 super-slim on exstending the PS4's lifecycle for another 3-4 years.