What will the manufactures try to extract is the better question? Answer: As much as they can.
The only other saw with similar technology (Bosch) to hit the US market cost 50% more than the similar SawStop product. They had to pull it due to patent issues (despite attempting a different approach), so we don't have good market data on how well it sold.
This just reeks of regulation forcing everything to be more expensive. I'd rather just see the patent go away and see what the market really does. I really can't image this technology being added to low end saws for less than $150 retail and then you have the per activation costs. It really kills the low end market, when a minimal saw is $500.