Re: I doubt she'll ever be Home Secretary, but...
That's in the gift of the PM.
True, but ms Abbott is now a Labour grandee, and part of their intellectual talent pool. If he wins, Corbyn will be accused of misogyny and racism is she doesn't get one of the top three Cabinet jobs, which are the Treasury, Home Office, Foreign Office. Even Corbyn's not going to let her be chancellor, and with her renowned brains and diplomacy he can't afford to let her loose abroad.
And looking at the rest of the Labour front bench, who else is there?