I see them being this big as positive in that it forces the remaining parties to finally figure out how to properly cooperate, as the CDU/SPD is a very unlikely coalition considering the last legislation period.

The current Jamaika Coalition has basically put everyone in panic because for the first time in forever the major parties can't just vote what they want into parliament via coalition contracts.

The AfD will be reabsorbed, don't worry about that, that's how it has worked the last couple decades. And in the meanwhile they can exert some healthy pressure on the rest of the Bundestag to get a bit of fresh air in there.