With the money that Bavaria received from the sale of Lewandowski, it is impossible to buy anyone at all who would correspond to the level of Bavaria. But Bavaria has no shortage of money and can afford much more expensive purchases and I hope they accept this reality that the "cheap" options have run out. I think that Füllkrug is just a cheap option that doesn't fix anything. If you make a purchase, then it must have some meaning.
Bayern Munich can surely go beyond the length of purchasing expensive players that is why they are still at the top, they have got quite the team now, and why would they prefer cheap options if they can get a more decent player for the right price, but I think they have done a great decision in letting go with Lewandowski for a higher price because they surely feeling it that Robert Lewandowski doesn't want to play for Bayern Munich now, that is why it is a good thing to trade him while he still has a worth value,
Niclas Füllkrug is surely having good time in this season, and he can give good performance for the Bayern Munich which is looking for the striker and his performance in world cup is also good which is also giving good opportunity to Bayern Munich that think about him with most chances Werder Bremen will not create any problem, and they will allow him to join the new club for his bright future in last few weeks they are looking for the new striker and their target is Harry Kane which is not sure about coming into Germany but with this signing their performance could be improved.
Few other options are also available but what Bayern Munich management thinking and having plan we have to wait for their next move about their search of new striker.
Well, I haven't seen any final verdict yet, but it is in the talks that Niclas Fullkrug could be paired with Thomas Muller, and said that this pair is Germany's attacking answer in getting the championship, and yes Werder Bremen might not give any problem at all but let's just still waiting for further news on this matter,