The buyer pays about $600 extra for the "Internet-enabled" version of the car. It's an option; you don't have to buy it, and, after this, probably shouldn't. If you didn't buy it, software updates require a dealer visit. I have a 2007 Jeep Wrangler with no external interfaces, and it's been in three times for software updates for basic automotive functions, such as stability protection and engine restart.
Cars go back for recalls all the time. Having to physically replace a part isn't a big deal. Dealers have a supply chain in place for obtaining parts from the manufacturer.
It's an option; you don't have to buy it, and, after this, probably shouldn't.
Unfortunately, at least for some cars, all these options are bundled together in packages. Unless you buy the base model, you'll get the Internet as part of a package of other features that you want.
I think that nowadays the better answer would be to go in and physically rip out the cellular antenna. Easier said than done.
Cars go back for recalls all the time. Having to physically replace a part isn't a big deal. Dealers have a supply chain in place for obtaining parts from the manufacturer.