One of the worries is that the quality of the Bundesliga is down. A year before 2014 the Champions League final was contested by two Bundesliga teams. This year it had ONE team qualify for the final 16. Worse yet, on the coefficient table Serie A has now passed the Bundesliga for 3rd best league in the world and if UEFA hadn't changed their rules you would've lost a champions league spot.
It might not matter and Germany might still romp to the title. But the quality of weekly opposition at the club level is not be as high as what the 2014 team.
On a side note, the Bundesliga is a confusing league to an outsider. It just seems like teams from giant cities like Hamburg, Frankfurt, and Berlin should be better. Why aren't they?