I agree with you. Bayern Munich's elimination from the DFB Pokal is good for Bayern Munich. Now Bayern Munich will be able to focus more on the Champions League matches. If the schedule is too busy, it becomes very difficult to maintain a good performance. Bayern Munich's performance in the Champions League matches is very irregular. The team is in 13th position in the points table. Bayern Munich has lost two out of 5 matches. Winning the Bundesliga title will not be difficult for Munich. However, doing well in the Champions League is very difficult for Bayern Munich.
The elimination in DFB Pokal won't automatically increase the chance of Bayern Munich winning the matches in UCL. The level of these competitions is different, UCL is surely harder than DFB Pokal. If Bayern Munich still couldn't get optimum results in UCL, it wasn't because they have another focus on domestic matches. I think it is because Kompany has no much experience in UCL as a coach. However, it is not too bad that Bayern Munich is 13th place, they still have the chance to qualify for the next round. But they probably need to struggle at play-offs phase.
In Bundesliga, Bayern Munich is leading with quite convincing points. But I think it isn't a very safe point, there is still chance that other teams can overtake it. There are still many matches left, it won't be so easy to win the second half of the season. In many cases, the second half of the season will be more challenging than the first half of the season. So, Bayern Munich must be always very careful and don't miss any opportunity to get 3 points.