I think Manchester United will choose to not sack Ten Hag because he already bring FA Cup trophy without any expectation. Next season there are many teams changing their coach and their players, so they should have higher chance to finish in the top four considering Liverpool, Chelsea and Aston Villa will not be as strong as this season.
They also qualified for Europa League too, if Ten Hag can win this competition even though they didn't earn anything in domestic league, The Glazers might will think twice to continue with Ten Hag again.
Even though he won the FA Cup, many fans hope that if ten hag is immediately fired from his position, ten hag is not able to provide what fans expect today after Manchester United spent a lot of money to support ten hag in restoring Manchester United glory so far, but in fact, after bringing in many star players and also expensive, Manchester United is getting worse than when ten hag first came, The FA trophy is the second biggest trophy in the English league but I think Manchester United will not lower their target from the premier league trophy to the FA if Mourinho or Ferguson are still coaching Manchester United at this time, to be honest, as long as watching Manchester United win the trophy it seems that now it is indeed a pride for ten hag to celebrate the championship trophy as if winning the FA trophy like the EPL trophy.
The squad owned by Manchester United today is of course very capable and can even be said to be full of star players, but unfortunately ten hag failed to make them able to show their best performance like in their previous club, I think the Manchester United squad is more than enough to compete for the championship trophy but indeed the scheme and also the strategy applied by ten hag seems to have been confused and ineffective to defeat their opponents.