"........Saudia Arabia is being used to counteract Iran on many fronts........". Yes agree. But like Syria , outside powers to the Yemen conflict will all follow the same agenda to different degrees. It is only the Yemen people, like Syrian people, who can truly unite their country.
To unite Yemen, then all parties to the conflict must negotiate and compromise. Including the Ansar Allah. I remember that Hadi supporters objected to the changing of laws into Islamic laws, as demanded by Houthis. They wanted a secular constitution.
I am saying that if a compromise constitution can not be agreed upon, then no side should try to impose their will on others by military force. A different Federal arrangement, allowing for regional autonomy is a better solution and alternative to the present conflict.
Yemen was divided before along tribal lines, reflecting in different " socialist" ( tribal) perspectives. The roots may go back thousands of years. The Federal Republic will allow for a weaker national government. But it is better than having no government and war.
It looks like Yemen will split into a north and south or similar again.