The thing about these concessions is - frankly, we still don't know if it the degree that the changes will even close the gap. McCarthy has sold the farm and liquidated all of his other assets, and it *still* may not be enough to win the job.
On one hand, one imagines this is the best it's gonna get for the 20, but OTOH, there's a percentage of that group who are intractable and may be impossible for McCarthy to overcome.