Without nitpicking the typical coalition details here, I want to consider a more general point. It's somewhat self evidently not a great thing for countries to be swapping systems back and forth dramatically based on margins of a few percent. It's unstable and will inevitably lead to a systemic collapse as the shifts grow greater and greater over time. It's rocking a boat back and forth.
I would go one step further and say that executive power should be dramatically reigned in, and that laws should take an 80% consensus to pass. And laws also have to be renewed every 'x' years with a similarly large consensus, perhaps with a method similar to constitutional amendment to allow for permanent laws. Under such a system you'd absolutely have to collaborate to ever do anything. And I think this would be a very good thing.
Such a system would also completely do away with divide and conquer as a political strategy, which again is also a very good thing - as that's likely one of the biggest causes of instability in the Western world today.
I would go one step further and say that executive power should be dramatically reigned in, and that laws should take an 80% consensus to pass. And laws also have to be renewed every 'x' years with a similarly large consensus, perhaps with a method similar to constitutional amendment to allow for permanent laws. Under such a system you'd absolutely have to collaborate to ever do anything. And I think this would be a very good thing.
Such a system would also completely do away with divide and conquer as a political strategy, which again is also a very good thing - as that's likely one of the biggest causes of instability in the Western world today.