If you read it again you may notice that I didn't put them into the same category.

CDU/CSU will try to take the same topics the AfD used to enrage its voter-base and will present itself as the "rational, conservative and experienced" alternative to the "concerns of the voter".

This is the process which will cause CDU/CSU to not publicly condemn the AfD and its narratives, will make the CDU/CSU to "sacrifice" themselves as the coalition partner who will "control" the AfD, secretly hoping to convert their voters into CDU/CSU voters while AfD destroys itself due to its lack of skills to actually deliver in government.

In the end the AfD MAY or MAY NOT actually collapse if they are forced to deliver on their unrealistic promises. But it won't matter, because #1 the party will not die because it will present itself as the victim, and #2 the whole exercise will do such a substantial damage to political discourse and democracy that it will take decades to recover from it.

Again, one can hope that THIS TIME it will be different...