I don't think filling Lewandowski's void will be easy for Bayern Munich. There is no doubt that Lewandowski is a talented player. But more importantly, Lewandowski has been with Bayern Munich for a long time. He played 8 long seasons with Bayern Munich. And so he blends in very well with Bayern Munich's players and match tactics. This is why it is difficult for Bayern Munich to find a suitable replacement for Lewandowski. But they can recruit young talented players.
Bayern Munich did not make the wrong move by releasing Lewandowski from their squad, because apart from Lewandowski having been at Bayern Munich for a very long time, in the end the team also needed younger players to be included in the Bayern Munich squad. And besides, Bayern Munich can still dominate the Bundesliga, although it will be a little difficult for other leagues such as the Champions League.