I recall a few people saying that Goblins couldn’t ever be Monks because they could never be “Zen” enough, and their Greed makes it impossible to be Monks, let alone selfless.
I think I’ve already cited Gakkiz Blusterblast as an example in this thread (And if not, hey! He’s a Goblin Monk!)
But in the DK starting zone, in the quest where you have to kill your old friend to appease the lich king, the Goblin mentions how you saved their life by helping them kick what’s essentially a drug habit.
You were the only good goblin I knew. That’s how I ended up in the Argent Dawn, because I knew it’s what you woulda done. How could this have happened to you?
So Goblins can be Altruistic when they need to be of course.
But also, there’s a Pandaren in the Horde side of Ashran who is meditating near a Goblin machine rig who says that the sounds are “strangely meditative” to him. So who’s to say that other Goblins wouldn’t find comfort in that?
Of course, since Worgen are the mirror race to Goblins, I’d really hope for Worgen Monks as well, especially since their whole thing is finding balance between their “Civility & Savagery”