You won't understand if you have grudge against Arabs. Which is evident in your post. Afghani Taliban did resist invasions, however so much corruption inside Afghanistan made it very difficult for them. Much rape and drug business evolved. And then many people couldn't be trusted. This is why Abdullah Azzam was assaisinated by insiders. Which then erupted into infighting between Islamists.
This is first time in Arab world we had major sectarian conflict. Which as you said, Arab governments didn't find important. Only Saudi Arabia did, and Saudi Arabia under Abdullah had diferent priorities like preventing growth of MB. He also feared arming Syrian rebels too much due as Jordanian monarchy feared results afterwards. Now that Salman is in power, priorities have changed. Which is all that is needed, there is no need for direct support. If Syria and Iraq are controlled by Sunni Islamists, defintely expect some sort of Western action, but they can't win instantly. Because it's guerilla war but also Sunnis of region won't support the war, which means it will be prolonged but cause other problems in the region. Then other things will follow.
Anyways, I will stop here and not get into it since I'm not going to waste my time with a Shia Iranian worshipping clown who has ambition for power. That will fabricate hadith and use religion as tool to further their interests. Not to mention make completely false narratives.
No, he will not stay because the Muslims are fighting for sake of God ad God will give them victory. Has nothing to do with the West you idiot. You are buddies with the West, if it wasn't for them Iraq would be lost by now. Yet of course demonizing sunnis as 'puppets for Israel'. Because the fantasies of your Iranian empire have put to an end.