It'd be a wise choice for Bayern Munich to keep Goretzka at the team for a long term. He's played in 28 official matches so far. And he scored 8 goals and made 9 assists in these matches. He also scored the only goal in the Leipzig match the last and it was a very valuable goal that helped Bayern pull away from Leipzig in the table. So his contribution to the team is really great and I hope we can watch him at Bayern for many years.
He is just 26 years old and he had a great year, I am sure he is going to be very happy to stay and they will offer him a good sum of money as well, money that no one of us will ever see in our life time for just 8 months of football from him (up to 10 months sometimes). Obviously he is going to accept, plus aside from maybe few more dollars what does he gain from leaving? I am sure there could be some Qatar team willing to pay a lot for him yearly, there are a lot of rich clubs there, do you think money is always the right answer?
Moreover he is not going to go there, so that clears the question if money is the main thing, so he prefers Bayern over "some" teams even if they offer more money we know that, which leaves only slight number of teams that might offer more and he would be willing to leave and I think those teams will not offer him more than what he worths.