@NTA
It isn't just Foster and just replacing Foster almost certainly won't fix things on it's own. We need far deeper analysis & change. When you have businesses performing as poorly as this team, you need to look at what has happened and why and identify the root causes of the problems and then fix them. That's up to NZR.
I'm not going to step back into my career, but one example: We have two All-Time Greats at 4 & 5 nearing the end of the road with no clear succession planning until last year when Foster blooded Lord and Vaii - it was all about hoping Pat T would come right or sticking a 6 in at lock. There's a 10+ year gap in age between those two pairs. Ditto Hooker with Coles & Taylor
That really isn't Foster's fault (and to give him credit, he's been very open to developing new players) but down to previous Head coaches and selections.
So who in NZR was responsible for spotting this, didn't notice, express concerns and help fix the lack of succession planning in key positions? Did they have a process in place to identify and action issues like this? If not then why?
Plenty of people other than the Coaching team need to take a good hard look at themselves, accept they have had a part in the problem and either fix it or bugger off and get someone else in to sort the problems out.