For sure Nübel dosnt want to be again on the bench when Manuel Neuer is back again and full of health.
Emiliano Martinez is also already 30 and maybe they try to get him for at least an contract of 3 or 4 years.
This would be pushing his Career , but i think that there also other Clubs now will be knocking on his door.
Of course many teams are starting to consider Martinez after performing well with Argentina, and of course that will push his career to be better at the team level. Regarding Nubel, I think Bayern Munich will fail to bring him home in the end, unless he is guaranteed to play regularly in one or several competitions.
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Everything is still a rumor, I also do not know what the final decision will be. But so far Bayern Munich have one good goalkeeper too who has been doing well since Neuer was injured.