[stale2002]

Currently 93% of the hashpower is signaling that they will switch from the legacy chain to the new hard fork.

If the main chain has a very low hashpower, then anybody and their mother can attack it/double spend/ ect very easily.

The miners on the fork could even commit some hashpower on their own to attack the old chain, so as to make sure that the new one wins.

Bitcoin cash never has the support of any significant amount of hashpower, so of course the main chain is still around.

[Nursie]

True, but event 7% of the BTC hashpower is quite significant, and we may find that the 'old' branch lives on as another "Classic" or something.

Guess we'll see.