But it did answer the gap filler question.
Except for the math that supports "All will be OK".
As reenforcement from the F-35 JPO, General Bogdan said, "The move to trim orders for the USAF wouldn't harm the effort to cut the average cost of the main model (assumed to be model A) to between $80M and $85M by 2019, when adjusted by inflation". Bowden expects (as you do) the overseas deals to fill the gap left by reduced USAF purchases and forecasts total domestic and international sales of 873 between now and 2021, 20 fewer than forecasted in 2015. However, these numbers include as many as 60 from Canada where the competition has been reopened by the Liberal government. They best hot foot it up to Canada to keep the anticipated F-35s from morphing into a different aircraft. Keep in mind the video was only a Senate sub-committee, not the full Senate Armed Services Committee.
As a side note, the Pentagon plans to invest $100M during the next year on cost cutting efforts, building on the $170M spent by Lockeed-Martin and BAE Systems PLC during the last three years. Question: As a result of this three year effort, did the cost of an F-35A go down or up? Was it really cost reduction oriented or problem solving money?