50 seaters aren't disappearing overnight. United is investing way too much money in C5 to drop them in 2 years. 5 years is a different story and maybe Air whiskey isn't included in the big picture.
I personally wouldn't go to C5 as you will be on reserve for ever and the commute will be killer. I know nothing about whiskey but they have an IAD base which would be ok but not sure how senior it is. As much at G7 is the 3rd choice, living in base is great and nobody knows what's going to happen in 12 months.