That is up for the users to decide.

Generally, forking is just creating another copy of the original source code but with added codes and features, nothing more. Some improvements from the previous, original versions are found in the new code that the developer of the fork "believes" that should be added in the main coin. The users then (but more specifically, the miners who control the hash power) decide which coin would they use and they prefer. The original coin may die, but in most cases, the fork often loses support after it has been pumped hard and dies ultimately.

That's how I view forks now: money bags and disruption.