I don't know if I would see it as a pure money grab. Pretty sure game consoles, just like inkjet printers and the like are sold with zero or near zero profit (or even at a loss). The benefit the console manufacturer gains from the platform lock-in far outweighs whatever greed they might have trying to reap gains from the hardware. 10 year old hardware is roughly 30x slower in FLOPs, so we might be looking at a desire for better games or easier software development - I for sure would not envy the developer needing to target 10 year old hardware, though it's not exactly unheard of.