That's a bit like staying in a marriage that has run its course because you can't find another partner.
If he's not sackable now, then when is he sackable? If you set the precedent and accept 5 out of 6 defeats is acceptable, then you pretty much deserve everything you get and the fans who pay good money will rightly voice their anger, it then becomes toxic.
The argument of it depends on who we replace him is beyond ridiculous.
It applies to every single managerial change in the history of football, and indeed business anywhere across the globe. It's not a factor. It's utterly insane to use that as an argument. I won't pander to this useless mediocrity.
Who do we get in that's not a backward move? We need to go all out for a Conte/Simeone level of person, BUT we've no chance with our current situation..