The reports come on a day when Germany is making headlines for a whole different reason, after beating Argentina 1-0 to win the World Cup trophy. Pictures of Merkel surrounded by the national team are likely to only cement her popularity in Germany further.
The Chancellor received a ringing endorsement from voters in last year's elections, when she promised to serve a full term, winning 311 seats for the CDU party and a bigger share of the vote than in 2009.
Her election pledges centered on a tough stance on austerity for debt-ridden euro zone nations – something of a hot topic in Germany, which is the 18-country group's largest economy – and the biggest contributor to the bailout of peripheral economies like Greece, Ireland and Portugal.
Read MoreMerkel wins resounding victory in German election
If Merkel steps down sooner than expected, the role of Germany in the euro zone and the broader 28-country European Union would be called into question.
"She has been instrumental in allaying fears about a break-up of the euro zone and, to all intents and purposes, is Europe's chancellor," Spiro added.
"Indeed, given the weakness and unpopularity of other European leaders, with the possible exception of Italian premier Matteo Renzi, a post-Merkel era almost doesn't bear thinking about from a political standpoint."
Merkel has played a prominent role in determining the future of the EU, pushing spendthrift members to tighten their belts, blocking the creation of common debt such as the "Eurobond" and resisting further measures that would jeopardize Germany's economy.
You can read the Der Spiegel article here.