It won't be, but it will paper the cracks untill we are back to this shambles again.
I think winning a trophy - unless he somehow turns this around and we get top 7/europe (very very unlikely now due to losing yesterday) - then for me that buys him time as he will have got us our first in 20 years.
The fact is then he will be given a decent budget (and he is very good in the market ), but even so I think he'd still have to show immediate signs of turning our home form around.