>>690847301. MCNs still exist
2. We literally see a vtuber company die every other week.
3. A competent vtuber corpo isn't like an MCN and are providing actual things of value, such as models, branding/marketing, whatever other stuff. MCNs meanwhile basically just handle some of the clerical load while leeching. This makes it much easier for affiliated streamers to bounce from MCNs when problems arise.
4. MCNs (mostly) died off because youtube automated much of what used to be their workload, with combined elements of terrible management (Maker, Machinima), and generally staying constrained to a small and undiversified circlejerk of niche channels (Channel Awesome).
5. Taking advantage of simps is the world's oldest profession and vtuber corpos cast a pretty wide net with talents, and with both the company/brand itself and the individual girls acquiring very loyal fanbases that are both separate but still very related, it creates a structure much more resilient to fame decay. When new girls join they get an immediate head start from the corpo's fans (joining Hololive guarantees you 300k subs overnight, joining Mythic doesn't), then they grow their own fans, which they then drip feed back to the corpo and any older girls with dying relevancy via typical corpo interaction. Fame decay is still a factor obviously, but it's much more manageable as long as you aren't catastrophically yabbing every week and poisoning the viability of the root brand.
Any company that has managed to climb out of 2view hell literally just has to avoid being self sabotaging retards like Nijisanji, and they can coast for at least a decade. The only major external threat to the business model is AI waifus looming on the horizon.