I would love to have the chance to move to mainline too. Maybe it will happen, maybe not, maybe it would be similar to moving from the ER to the Intensive Care ward, who knows.
Only thing for sure is that our management ( a complimentary and VERY nominal term you appreciate) has its strings pulled by mainline. Hence you can depend that our combination of in-house managers have their priorities set on getting mainline contracts (most of all our CPtech) and our mainline imports have both already tried to rebid into other mainline positions (AM) or similar. Our main man has probably sussed he is with us sink or swim, but HE has a golden parachute back into mainline.
Bottom line - anyone's guess, but I would bet my redundancy money (ha ha what a paltry sum) on the whole lot reducing to a rump of MAN/BHX, and no mainline options.
Think of what you would most like to happen, think of the most uninspired, octogenarian led cockup, and you have where we will be come mid next year. Laugh, I could write a book about this lot.