It looks like Manchester United are also aware of how important he is for the team now. He is still making very important saves for the team and making a big impact on their matches. They don't need to find a new goalkeeper yet. De Gea is still young for a goalkeeper actually. He can play at least a few more years and continue to perform like this. This performance level deserves the starting eleven undoubtedly.
Yes, it is going to be better for de Gea if he stays with Manchester United. At this point, it is going to be bad for him, if he does decide to go to another club. I'm sure that it will be hard for him to find his place in a new club. But in Manchester United, if he can improve a little bit he will be a regular goalkeeper for sure.
Also, the well-connected Brazilian legend Ronaldo Nazario has offered to search for a suitable coach for the Seleção Canarinho.
The former Spain coach Luis Enrique Martinez currently has a better chance of clinching this top job. But there are also speculations that he is currently targeting club coaching.
Luis Enrique seems to be the best bet for Brazil right now. You know, the other big names are either already managing another team or not available at this moment. So, I do not see any other coaches being better right now compared to Luis Enrique.