GoPro has a huge professional market as well; you might be surprised at the amount of footage you see on TV and in movies that's shot on a GoPro. If I had to guess on an acquisition I might look at Canon or Nikon, but the reality is probably PE.
I wonder if quiet negotiations are already happening and this shutdown was to court a potential offer.
My money is on DJI buying them.
I wouldn't be so sure DJI already makes better cameras. For whatever reason, DJI made a decision to go their own way. Maybe irreconcilable differences with GoPro, maybe GoPro unwilling to work with them, whatever the reason, DJI cameras have long since marginalized the need to a GoPro on their gear.