It may be we are holding out for Wagner in the summer but i am not sure he would join even if we were in the premier league.
His stock is pretty high at the moment, he was linked with the Leicester job not long ago, he did miracles at Huddersfield and probably left at the right time but even if we did go up and he did join, he would be faced with a similar type job he had at Huddersfield so i am not really sure its a career progression for him.
I would be surprised if Moyes was interested, if it had been after his time at Sunderland he may of been interested it but he rebuilt his reputation at West Ham and again i would imagine could probably target better jobs than a promotion chasing club or newly promoted club (a brighton or burnley type job, not necessarily them but clubs of their standing) I would put Allardyce in the same catergory too.
We probably do need somebody who has a track record of decent football and if they come in now or if we dont go up, somebody who has a promotion pedigree, it may buy them more time than previous managers and if that is the case Jokanovic seems the standout realistic one but he doesnt stay at clubs long, often of his own accord.
The big worry is we go for a name who has struggled at numerous clubs, ie - Mark Hughes.