To 'celebrate' for two days

I am not inclined to accept the ulterior motives thesis. It is a baseless and illogical statement that defends a conservative position in an irrefutable way that neutralizes common sense and considerations of explanation. And yet, in order to change a regulation, even if its rationale is invalid, a court of law is required (something that one minyan requires another minyan to permit). This is probably what you called 'the stability of the halakhah'. On a principled level, I'm completely in favor. A second term is a pointless and illogical law in our day, and I won't justify the forces of unemployment. But it's hard to do that without a minimum consensus.