>>1244747Guras a weird case. She had a really strong start, but honestly I think its more than anything that she was the first EN vtuber to get mass exposure. As time went on, people either settled into other EN vtubers, mainly her genmates, or moved on from Vtubers as a whole and found and went back to watching anime or regular streamers, or whatever they watched before.
As a result her numbers were huge at the start but petered off fairly quickly. A better person to represent the trajectory of (English) hololive would be Mori or Amelia since they didn't have the "new stimuli" hype behind them like Gura did.
Numbers will probably go down as the world normalizes, but we're less likely to see a long term down turn like you're predicting and more likely a slight drop off followed by continued growth, albeit at a much slower pace.