I would guess that's the reason for the price reduction if they are not sold before IAG takes full control of bmi.
Having said that it would not be simple or straight forward, especially in WW's case with a full Summer schedule ahead and I guess saying to the boys and girls at the sharp end BTW your finished in Autum would not be er? motivational so they would have to offer either an enhanced retention package, unlikely or bite the bullet and an immediate shut down, again unlikely or more likely continue to seek disposal.
With regional it's more difficult to see a positive out come E135/145 are a waste of a LHR slot and flying for beeline under IAG won't can't last, there's not much left, Flybe might make some sense? but what to do with the ERJ's are they owned or leased?
Perhaps a third way might be to get someone to take on WW & bmir, if the ERJ's are owned, then gifting them in to a new set up as assets might add some meat? They could share a lot of the back room stuff, the 737 or more likely ERJ's could become a fleet and a lot of overheads would go at a stroke. The new company could cut an exchange deal with Embraer with owned ERJ's traded in for E Jets which would work well on WW's short routes or thinner longer routes? Just a thought, probably a daft one