If AI is ruled a serious risk that requires a government kill switch you won't be running any open weights models on hardware you control. I expect that's what the FSF is afraid of. That's why they refer to it as hypothetical technology as in "assuming such a kill switch was developed".
It might seem far fetched but consider that you are probably (based on the American readership of this site):
- not permitted to buy more than a few grams of effective cold medication per day and have to show ID, which goes in a tracking system, in order to do so.
- while you are allowed to purchase microcontrollers, if you install this on them they are illegal to possess
- possession or use of all manner of chemicals, combinations of chemicals and shaped metal considered dangerous will get you prosecuted with various degrees of zeal
The big AI companies, who already possess the most effective possible actual kill switches, seem oddly enthusiastic about the whole thing.