There is an almost constant debate in many Western countries about term limits for elected politicians. In general, these discussions are more frequent in non-parliamentary countries, where the executive does not sit in the legislature and many legislative districts tend to retain the same representative, or at least the same party, for many elections.
In the parliamentary system, the government almost automatically changes when the composition of parliament changes, and the phenomenon of a long and unbroken incumbency of the head of the government is comparatively rare. If Justin Trudeau leads the Liberal Party in the next election next year, he will be seeking to become the first Canadian federal politician to win four consecutive elections since Wilfrid Laurier succeeded in doing that in 1908.
