Bono's performance didn't seem good in the club and you shall also remember if bayern needs a goal keeper that has a very good performance with the club.
I think you are right, at club level Yasin Bounou is not very good and so far Yasin Bounou has conceded a lot of goals at Sevilla in the last 14 games. He is more than 30 years old and is considered by Bayern Munich, and it looks like that will make the transfer impossible. Yasin Bounou had some good magic during the World Cup but I don't think it will ever be the same at club level. Several teams might be ready to sign him from Seville, but not Bayern Munich.
Sven Ulreich should be the goalkeeper who will get many chances at Bayern Munich if Manuel Neuer is injured or no longer gets a contract extension. But considering Sven Ulreich's age, which is already 34 years old, it is important to get a goalkeeper who is the younger of the two.
In fact, Die Roten have backup goalkeepers like 34-year-old Sven Ulreich and 19-year-old Johannes Schenk. even so, it looks like Bayern Munich wants a goalkeeper who has almost the same quality as Manuel Neuer. and the first candidate to replace Neuer is, Alexander Nubel. in fact, Nubel himself is a Bayern Munich goalkeeper who was loaned to AS Monaco. Bayern has a clause to repatriate him. however, the situation was getting more difficult considering that Nubel himself did not want to return to the Allianz Arena as long as Neuer was there because he did not want to just be a back-up.
That's why other names have sprung up like, Yasin Bounou, Livakovic, Yann Sommer who plays for Gladbach, even the latest rumor is Emiliano Martinez. however, so far neither one has actually signed a deal with Bayern Munich. although actually, Dinamo Zegreb or Sevilla. has responded to the needs of Bayern Munich. it's just that, so far there has been no official statement regarding who will replace Neuer later. so, we will just wait until there is an official statement from Bayern Munich.
The biggest factor about Yassine Bounou is going to be his age. He is already 31. And I would say he is just another average goalkeeper. He is not even above average. At least thats my opinion about him in club competitions. In the World Cup, he did show some good performance. But I also agree with you that he is probably not going to be able to continue that performance in club competitions.
Sven Ulreich is a better goalkeeper compared to Yassine Bounou in my opinion. But here comes another problem. He is also 34 years old. But I still think that hes going to be better. And this could be a good thing for Bayern Munich because they might want to keep him for one season and if they get another better goalkeeper, they can always say goodbye to Ulreich quickly.