So what as regards Blackrock..... hard forks have happened before (think BSV and BCH) ... so Larry Fink and company can hardfork to a version of Bitcoin called BTCBL whatever .... and they can see if they can get ETF interest in this version. Change the code for unlimited supply ... it just will not be Bitcoin....
Nonfungible, Finite, Decentralised POW ......
RE: How Solid is Bitcoin? ...Decentralisation under Threat