The ship has sailed on Loring AFB, long ago. I did a review of that base years later (1997), and while much of the physical plant is still there, it would be a major job restoring function to the site. For one thing, the base is some considerable distance from any supply lines (i.e., railroads or ship harbors), and there are no longer any serviceable pipelines to deliver the vast quantities of petroleum-based fuels or lubricants needed to support the presence of long-range bombers, or the ground crew that would also have to be present. Local economy is pretty much in the tank, and while the presence of the military base would perk things up a lot, it would always be operating on a false base, entirely at the whim of persons and agencies far removed from northern Maine.
Not even an option to try to re-open that post.
By most indications, the Air Force does not plan to re-open any bases for the B-21, even if they get the “full order” of 100 aircraft. They will simply add more facilities/ramp space at Whiteman, Minot and Barksdale. Of the three, Barksdale will probably be the tightest fit. I remember when the base had Buffs, KC-135s, KC-10s and reserve A-10s. Parking space on he ramp was at a premium.
I was stationed there in the early 60’s...I loved it!