1. Of course costs for this program go up and well beyond the estimations. Have you really expected anything different? the low numbers are only given as long as they want to sell the contract. Once they got it, they milk it.
2. And yes, I too think this is the last major manned fighter program. Maybe they experiment with variations and updates for existing fighters, cloning some models from them on the basis of already exiosting designs. But a new program from scratch?
I read THE AIR FORCE TODAY TRAINS MORE DRONE PILOTS THAN FIGHTER PILOTS.
Also, point 1.