Eventually they screw up and someone ousts them on a change agenda. They have PR in Germany and nothing ever changes. Merkel was wielding power for nearly 20 years and was chancellor for most of that time.
Strawman argument.
The length of time in power is not proof PR isn’t democratic or not working.
The length of time in power is actually counter-intuitive to motorbiking's argument, that PR isn't democratic or working.
If a government is in power for a long time, and 20 years for the same leader, in a democracy, is a long time, then it suggests that a) the electorate are comfortable and satisfied with that leader, b) that the policies are acceptable, c) that the government has the respect and trust of the people, d) that the government are an acceptable alternative to severe swings to far-sided politics, e) business is comfortable and satisfied with policies and the stability of that government.
In addition, as Germany is considered to be the most successful nation in Europe, then it also shows that the economy thrives under stable government.
In addition, in countries with PR types of democracies, has there ever been any discussion about changing to FPTP style of elections?
If not, that also would suggest that the PR system is more universally acceptable.
Whereas, a change from a FPTP, to a PR style of government is a regular discussion in UK's FPTP system.
The recent referendum was a bit of a compromise. It was a referendum on AV, not on PR.