If we accept that he's going sometime in the near future his replacement would either be another 'big' name in the hope that he can suddenly get game changing improved performances from the existing squad plus maybe one or two new faces or alternatively build for the future by appointing someone to do a long term job no matter that there may be some fallow seasons before the experiment can work.
If they choose the latter option there is a wish among old school Reds to try to find a Manager like Pep was at Barcelona or Wenger in his early days at Arsenal filling the team with a few retained players from previous regimes plus some from their academy plus some promising young players from elsewhere.
This plan may or may not bring long term success but the diehard fans seem ready to give it a go rather than just getting in another flavour of the month will spend a fortune on egotistical players with Machiavellian Agents who take a huge wedge of cash for very little return.
Some of the diehards are currently banking on Michael Carrick and ex U18's Manager Kieran McKenna to build a new team to be proud of. They seem to have given up on Giggsy, Neville and the other slapdicks from that clique.