I'm still firmly in the camp where sacking him now would be the wrong decision, yet my concerns are growing week by week. He needs to make changes soon!
However, the above statement is what worries me the most as he's whipping a dead horse at the moment with his tactics (Plan A), when it clearly isn't working.
When this doesn't work, which is frankly quite frequent at the moment, he usually then goes to a 4-4-2 (Plan B) which itself isn't particularly effective.
I understand sticking by your beliefs or approach in the mainstay, but it is now echoing Martinez's stubbornness and rigidity. If it doesn't work, then change it.
The most effective managers still have a particular style of play, however they're savvy enough to adapt depending on particular needs: opponents or situations.
If you're simply a one-trick pony and things aren't working then quite quickly things will start to unravel. We saw it with Martinez, Koeman and arguably Sam.