That's stretching it... But I get the sentiment.
Discussion
BlackRock can use their discretion based on factors they deem relevant to decide.

"is generally accepted as the Bitcoin network"
"generally accepted" ...by who?
COVID vaccines were "generally accepted" as safe and effective.
Bitcoin was (until very recently) "generally accepted" as being bad for the environment.
High cholesterol is "generally accepted" as unhealthy.
Psilocybin and other psychedelic medicines are "generally accepted" as dangerous drugs that fry your brain like an egg on a hot pan.
A Vegan diet is "generally accepted" as being healthier than a meat dominant diet.
US government bonds are "generally accepted" as a safe-haven asset.
UFO's were "generally accepted" as a conspiracy theory
The point is...the decision of what is the "real" #bitcoin is entirely up to the discretion of BlackRock, a company that has its own self-serving agenda that conflicts in every way with what is good for humanity.
Generally accepted by the shareholders. I realize I took an L here, but it will be up to them to hold the sponsors accountable, so it will be a market decision as it was with bcash and satoshi.
Yes ultimately the market decides but if/when it eventually happens BlackRock Vanguard Statestreet may represent a significant or even majority portion of Bitcoin's market cap. They will have no problem sending the price into 7 figures/coin just to entice current holders to part with their coins (which many will)
It's not just Blackrock choosing willy nilly. There's too much on the line for them to fuck this up.