Ange Postecoglou

Not sure it's inevitable. They're in a similar situation to us last season, and I can't see anyone wanting to step in as permanent manager until the summer.

They're not going down, and are still in the Europa League. The gamble is basically whether they think a change could win them that trophy.
Plenty of players coming back from injury over next few weeks so Ange will get the chance to improve results with them. I think he'll get until the end of the season and then Levy decides what to do. Win the Europa and of course Ange gets another season. Fail to win it and then he'll probably replace him if they can get Iraola (most fans on The Fighting Cock forum would like him), but also keep him if results and performances have improved significantly.

Changing the manager right now doesn't make much sense. They can get Mason once again and have similar results. And they're not getting managers from other clubs at this point of the season.
 
Plenty of players coming back from injury over next few weeks so Ange will get the chance to improve results with them. I think he'll get until the end of the season and then Levy decides what to do. Win the Europa and of course Ange gets another season. Fail to win it and then he'll probably replace him if they can get Iraola (most fans on The Fighting Cock forum would like him), but also keep him if results and performances have improved significantly.

Changing the manager right now doesn't make much sense. They can get Mason once again and have similar results. And they're not getting managers from other clubs at this point of the season.

I wouldn't rule it out, but I don't see why they'd wait into the week to do it, rather than just doing yesterday evening/this morning.

As you say, it'd inevitably be Ryan Mason stepping in for yet another interim stint.
 
Iraola would be mad to go to Spurs

This, why would he ever go to the Spurs train wreck? Seems like managerial suicide for Iraola who at the moment has a settled squad and is sitting far above Spurs. They will have to look at the unemployed manager market, or just go with Mason I would imagine.