Comment by Aeolun
Hah, I was going to say that sounded needlessly heavy handed.
Then I checked what the Netherlands does and found that changing the constitution doesn’t merely require you to get a majority, it also requires you to survive at least one election and keep that (super)majority before you can even begin.
Even that sounds easy compared to my country. In Australia a constitutional change requires a referendum, with a double majority condition to pass. Specifically it requires the vote in over half the states to be in favour, in addition to the overall national vote in favour.