Just the speakers, please!
Why? Because there is already an easy way for the user to sever the electrical connection between the headphone jack and the headphone coils: unplug the headphones, if any are present. This is easy to do, requiring no special care or tools.
By contrast, currently the only way to sever the electrical connection between the speaker headers and the speaker coils is to open the case and unplug the speaker cables from the headers, which is not wise to attempt without a screwdriver and an ESD workbench.