Use your logical mind a bit.... What happens when the total ETF AUM of bitcoin is 15 million? You cannot fractionally reserve an asset with a fixed supply where the majority of it IS known.

Where is blackrock going to get the money to subsidize it's miners? It's going to steal investor money? It's going to do this as a minority investor in these companies? How does it actually control the miners as a minority investor? It's like you don't understand how an ETF manager actually operates.

Node operators do not signal, miners signal, you have to make blocks to signal. Ok so we've determined that you don't actually know enough about how bitcoin works to be having a conversation about the way hardforks are driven in the space. Nodes don't vote, that's not how it works.

Study more, speculate less.