Nige will now be about 56.
It is more than possible (presumably having a decent stash) he may be ready to retire. (I know I would under those circumstances.)
It is possible that he might no longer care about footie future and reputation and may be prepared to manage til May to rescue the club which gave him his start.
In any other circumstances, it is very hard to see him returning unless the chairman decides to offer megabucks – which may, of course, also be possibility Innit?