Goates.
If the Airforce was buying 7e7 tankers then they would be subsidizing boeing. Keeping open a finished production line is hardly subsidizing passenger aircraft developement. Beoing kept building 707s well after they stopped offering them to the airlines in the form of AWACs and whatnot, but it didn't help boeing develope a new product.
Keeping the 767 line open with tankers will do nothing to help product developement.
Cheers
WIno