Yeah this is partially the reason why he is successful because Linkara is one of the few lolcows that's a content creator that is aware that pissing off or alienating your fanbase is a bad moveI feel like there's far too much shit in the comic book industry for him to ever run out of material. Bare in mind that he's been reviewing comics from Spider-Man's The Clone Saga annually since the beginning of his show. As he joked in 2017, he hasn't even reviewed a sliver yet of that one storyline.
His biggest obstacle to keeping going will be keeping his fanbase tuned in to what he's putting out. And he's shown to be one of the few content creators online that's smart enough to realize that your fanbase is what keeps you afloat.
Will he ever advance past what he's doing now? No. But has he found his niche that he can milk for a long time? Most likely.