I'm sure the question is being begged somewhere - send the 332s north to join the 333s?
It seems a fairly sensible course of action, given how similar the two classes are.
That can then allow most of the new EMUs on order for Northern to be concentrated around Manchester.
As I've said in another thread, Northern ordered 3 car 331s for use in West Yorkshire to allow 3,4 & 6 car workings. Another fleet of mainly 4 car would not allow them to deliver the capacity improvements on the Aire & Wharfe lines that they are signed up for. There are of course other technical issues it seems, which I'll leave to members with a better understanding of, but in short as things stand they couldn't replace the 331s planned for the area.
Indeed they would - I'd forgotten the TPWS detail. Perhaps the new expanded Doncaster/Sheffield Airport scheme could prove to be a new home for them? Maintenance could be undertaken at Neville Hill (assuming the space is there), but the main stickler would be pathing space for a non-stop (or limited stop) service between Sheffield and the airport - and that's before we enter the quagmire of electrification!
The DSA scheme is purely aspirational, reserved for Peel the owners of the airport, a few local councillors & MPs chasing votes and the Crayolista. And given that DSA's aspirations revolve more around an ECML spur than an extension of the Leeds-Doncaster locals or a shuttle service (and for the latter even 4 car EMUs would be massive overkill, with current numbers even a 153 might be too much for such), its not likely to even cross a DfT desk as a serious proposition for a very, very long time.