I don’t think Ten Hag will be worried about losing his job at this time in the season. Results are turning in their favor whether we think it’s impressive or not. The champions league may be the deal breaker, it will be really bad if they are knocked out of every competition. That will be a red flag for ETH to leave. Jim Ratcliffe will be looking to make some changes to the club, he has already told Ten Hag to sort his issues with Sancho. It’s left to Ten Hag to bury the hatchet with Sancho and do his best to assure the new owner of his ability to deliver
If he still wants to be at Manchester United for a long time, then he must immediately fix the problems in the club, be it in the game or things outside of it, such as harmonization between players and so on. What I see from Manchester United now is that they don't seem to have good harmonization. Because however in a club it must be created and will later affect their chemistry on the field.
Since Ten Hag joined Manchester United, I see there are always personal problems, and the biggest is his dispute with Ronaldo.
It seems like Erik ten Hag has a poor way of building harmony in the team so yes, the result was a collapse because he didn't manage to build good chemistry in the squad. I think, the main thing that a coach should do in building a team is about prioritizing harmonization, and Erik ten Hag does not have good skills in this matter. Therefore, then of course Erik ten Hag will not last long at Manchester United, because of course Manchester United also wants to have good harmony of course to support the team's performance to be even better.