Impact of setting "set -o vi" globally?

For a Red Hat kind of Linux, example a Red Hat 7 Linux, my question is this:

You can use "set -o vi" to use a VI compatible-feature set when using command line,

but what if this mode is enabled, and you don't use it.

Or, stated differently, what if you place it in the Bash .profile, but for any user and login, ignoring if the user in question is using it or not. This obviously implies the machine in question to be used by many/different people.

Is there a technical - negative - impact if using this mode, but for the people not using this mode ? Does it push away another mode ?