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Speaking of "X needs to do Y": if the influx of viewers is really from non vtuber watchers: >Nijisanji needs ABSOLUTELY URGENTLY to shore up the new audience to prevent them from sampling other companies
I sincerely think Salome has very little overlap in style and audience with (let's say) Kuzuha, Kanae, Ange, Sasaki, Chihiro and most of the company heavy hitters.
I think she has a huge overlap in style with Toya (for instance), but an even bigger stylistic overlap with the cute girls going cute things across the company borders
Assuming they're really new blood from outside the vtuber sphere, this new audience is not tribalistic and are likely to look around for comparable entertainment. In the odd chance they find it on other companies (Hololive, VSPO, 774 Inc) they won't have any qualms in watching the two of them, the three of them or however many of them.
Usually each of these companies rely on the "box" effect to, well, box the audience in but Nijisanji didn't really cultivate it. It is prime time they start doing so, otherwise they may end up feeding their very competition.
Someone mentioned that Tamaki Daruma interview MAGNIFICENT number might have happened because of a "waiting room effect", people waiting for Salome searching around for something to watch.
Bottom line is: it would be very advisable for Nijisanji to find a way to "box in" the incoming audience otherwise they'll end up growing the whole field instead of just themselves.