The Yemen War and Non Probability of World War III

Yemen war was not unavoidable, but the outbreak of war in the Middle East was. 
Some ask why the system did not prevent the war in Yemen.
Considering the fact that an assassination or a certain treaty were not the reasons for the first and second world wars, but only excuses for starting them; formation of a war in the Middle East while needed a simple excuse to start against any major country of the region that could have grave consequences. The Saudi dictatorship spent a big portion of its income to buy arms through the years and enjoyed the unconditional support of the West. And since the system did not want World War III, the Yemen war was accepted and the system tried to make it long and hard enough for Saudi-led coalition to prevent them from starting a great war in the Middle East. 
This goal has just been achieved. So the system's military aid to Yemen is considered to be over. And all agents that have put efforts in it will be thanked and must be highly rewarded. 
And at the end, to accomplish peace and revolutionary goals in Yemen, Houthis must leave power fully to their partner, the General People's Congress and move their forces to the northern frontiers. In spite of that, they can retain a part of their forces in critical central spots. It is apparent that the General People's Congress is loyal to recent uprising of Yemen but is not the main target of Saudi attacks.