Arabs can handle a war in Yemen on their own, they are more than 400 millio, majority of which nations are well armed and have large armies. If it was not for the presence of the US , Usrael would have vanished long time ago..
Yemen do not have a superpower support like Usrael had, so it is easier for the Arabs to overwhelm any rogue factions that have threatened to march on Makkah and al Madina (the real cause of the Saudi attack).
Pakistan can play a positive role of supporting both morally and materially, as should Iran, Turkey, Malaysia and Indonesia, and maybe Bangladesh too. for the sake of stability in the region, by convincing the waring Yemeni factions (other Muslim brothers) to settle down their differences peacefully.
Anyone who thinks it is only an Arab problem is not thinking strategically, since an attack on SA will destabilize the whole Area and will have international ramifications if only due to the Oil flow. Which might invite a Western coalition (dependent on that exact Oil flow) to invade Yemen and maybe hold some parts of KSA "under protection".
The game is quite dangerous and most Yemenis who wants to fight SA are very short sighted, short tempered and do not think beyond their personal anger and their tribe in Yemen.
In this sense it becomes more of a Muslim matter than a solely Arab one.
I am very glad that Arab and Muslim leaders to a certain point are thinking strategically and being proactive.
I also wish the best for Yemen, and will be glad to see it stable and progressing in all fields, they are the best of Arabs, party to the Arab world and need to be seriously lifted with massive help and support, for their sake, the sake of the Arabs and the sake of Muslims in general.