Just my two cents but I felt a dual buy of KC-30s and KC-46s was actually the right option. Former POTUS and SECDEF didn't think so but it had some merit, IMO...
https://blog.al.com/live/2009/08/why_two_tankers_may_be_better.html
The conventional arguments against it (fleet commonality, economy of scale, etc..) are great but when you have in reality only one supplier for a type of system, things get FUBAR.
Giving Boeing actual competition in the heavy military aircraft market for USAF contracts would probably incentive their behavior / performance in the right direction, they have the US heavy military market cornered and they know it, they need a true competitor to keep them on point.