If he is sacked by Sunderland he probably is done as a PL manager.
I somewhat agree with that thought as it has been a failure all around. At the same time though, Moyes could not have picked a worse job to go for in hindsight, no financial backing whatsoever and resorted to bringing in aging former players to have any remote chance of fighting relegation. On top of that they have had a huge injury crisis this season, losing quite a few players since August onwards which has stopped Moyes from being able to field a strongest 11. Considering they are currently without watmore, Cattermole, Anichebe and McNair all at the same time that is bound to have a big effect, not to mention Pickford only just returning at the weekend.
I suppose from his perspective it is fustrating to see him fail so badly with the tools he has. even the midfielder he signed in the summer has had injuries and AFCON, but again he was promised 5 players that day he signed him,and the board let him down again. If anything, Moyes this season is a prime reason why Sunderland should be relegated now, no backing, left out to dry and to be the fall guy when it all goes wrong, despite Moyes never really having a fighting chance there.