I sense a lot of opportunities on this, but unlike the paid Iraq contractor work, it is likely not going to be financially rewarding any time soon and can prove pretty costly no matter how it ads up.
What I see the real measure being on this is whether or not any serious money is raised to fund these guys going over. Right now I think a lot of them are collecting some sort of Uncle Sam money one way or another, retirement, disability, other stuff. Meanwhile televangelists are buying themselves mansions and airplanes.
What's really going to sort out on this is the division between the truly righteous and those who have just been playing all of this conflict as a social and moneymaking game except this does have a price of entry.
Getting people in and out of the country is a task of its own, but gives practice on the "underground railroad". Most likely involving flights between Mexico, Canada and the Middle East, specifically Kuwait, Jordan, and maybe Saudi Arabia. You can scam it through Israel, but I hear that if you have an Israeli stamp on your passport then try to get into one of those other countries, they can treat you pretty badly.
I see the real problem on this is funding. There is really no lack of volunteers from what I can tell in the commentary on the articles and youtube videos. Second is logistics. Making sure the people and supplies get to where they need to be in order for the tactical people to carry out operations. That's where I am seeing these guys as not being particularly combat effective. It is volunteers who can barely gas up their trucks to go buy some guns and knockoff surplus tactical gear at the local flea markets let alone carry out any combat operations, like cross desert rat patrol type raids against ISIS strongholds or rescuing Christian hostages.
Little stuff, they are having translation problems with their public relations works. That all could use some professional help too and I think a fair amount of that work could be done elsewhere. The plight of the Assyrian Christians could reach the hearts and minds of Christians worldwide if publicized right. I would imagine they could even get some participation from countries which I don't think were originally members of coalition forces, like Brazil and Argentina just on the principal of the matter, a lot of second world societies coming up on first world standards of living wanting to strut their stuff in the big arena without having to foot an American scale of foreign relations bill to make things happen.