If a country changes course every four years, how can the success of a long-term project be ensured? And what of its negotiating credibility? How can the other side trust that an agreement will hold in the future? This is not a critique, but a genuine curiosity, because there's an obvious drawback with a system with opposing world views. Unless, of course, something still unites them in the first place, with acceptab…
I'm not sure I follow the questions. The success of a long-term project can be ensured through the procedures described in the source article: you set up a durable judicial system, and invest them with the power to require that the country uphold its end of the bargain, no matter how much its current political leaders might want to change course.
That's an abuse of the judicial system. Politicians are elected exactly because the voters perceive a need to change the execution of government's functions.
The thing is, you cannot beat human moral qualities with formalist means. People who come to power by raising hatred towards their political opponents will always find a way to subvert policies even if not cancel them.
Long-term policies should be established through consensus among all parties, not though legalistic bureaucracy.