To bring an ex England manager back into the fold is a very Parish thing to do (think Hodgson, Allardyce) so a Southgate interim appointment doesn't seem an outrageous suggestion, particularly in the light of his Palace connections.
What would be in it for Southgate?
I suppose it would re-introduce him to management after his sabbatical and put him back in the spotlight.
Fairly low risk for him too as we're unlikely to need more than a couple of wins and a few draws to secure safety.
Europe would almost be a free hit.
If he did well it would put him in the shop window for a job with bigger clubs in the summer.
He doesn't seem to lack confidence that he's an elite manager even if this is wrapped up in a cloak of false modesty.
Personally I don't want to see it happen as, to use Roy Keane's term , I see Southgate as a 'bluffer.'
But if Glasner is to go I see an out of work Southgate as very Parish like appointment.