How likely is a German government break-up after the SPD’s disruption?

One day after the resignation of Andrea Nahles as head of the Social Democrat Party (SPD), Questions are being asked in Berlin about whether Angela Merkel’s coalition government could be on the verge of collapse. Nahles stepped down after her Social Democrat party’s disastrous showing in the recent European elections. But also after being criticized for her performance as party leader. Merkel says she will push ahead with the coalition. But others are not so sure