Be careful what you wish for.
In this case....none of the political parties want a fresh election.
It would be lesser numbers for Merkel’s CDU Party and the left-of-center party (the SPD). It would have to come after the September Hessen/Bavaria state elections, which mean they’d both influence the outcome of the national election. And then the question is....would this entire election revolve around what to do with migrants and immigrants (something that the fall 2017 election sidestepped and avoided in discussion)?
Coalition-wise, it’d be awful hard to figure the way an election works, and how you’d form a coalition in this weakened state. Toss on the fact that Merkel would not be in the new election, and a new cast of characters would be formed in the leadership roles.