We don't have to speculate, it has happened multiple times already[0]. What happens is the hard forks are either ignored or they are supported but under a diffe

We don't have to speculate, it has happened multiple times already[0]. What happens is the hard forks are either ignored or they are supported but under a different name to avoid confusion (e.g. Bitcoin Cash, Bitcoin SV, etc.). The only way I could imagine a hard fork succeeding (e.g. retain the "Bitcoin" name) is if it if it had an overwhelming community consensus, not only from miners but also from users (like Coinbase). [0] https://en.wikipedia.org/wiki/List_of_bitcoin_forks https://en.wikipedia.org/wiki/List_of_bitcoin_forks