That could be short term. Oftentimes I hear about these people getting more followers, but then I don’t hear about them ever again. There are exceptions to that obviously, but I’m not entirely certain on how many retain that fame.
Subscribers is a big number for YouTubers, but if I’m not mistaken, views for videos is still more important. And I wonder how easy it will be to continue making this kind of content a) after suffering an injury like this which will put him out of commission for a while and likely prevent him from doing particular stunts, and b) with the general hesitancy to approach people that this altercation will hopefully instill. So he could be looking at paying actors (would go poorly) or making his pranks more tame (would go poorly).
I’m not really addressing that facet of the topic, I was addressing whether those subs would be enough to keep his career afloat. But for the record, I’m not going to be subscribing as I also do not appreciate his behavior.