Earlier quoted context omitted.
If it turns out that too many people are disconnecting their tv, the manufacturer would merely add in a sim card. They don't yet ATM because they don't need to - too many people are stupidly connecting their wifi.
Wouldn't the free market simply provide modifications with the cell networking removed for an extra $50 or so? The "discount" you get from buying a smart TV verses a dumb TV (which is a niche product so it would cost hundreds more) would still be positive after subtracting the cost of modification.
The free market doesn't seem so keen on modifications, see phones, laptops etc. All walled gardens where even repair is discouraged.