[taylortbb]

The proprietary RF systems other manufacturers use aren't likely to be any more secure. They're just less analyzed.

Keyless ignition is popular enough with consumers it's likely here to stay.

[Cthulhu_]

I don't believe they're less analyzed; they're just less published about. Car theft is a big industry.

The last one I heard about was keyless entry systems being abused; thieves carry a briefcase-sized antenna around, amplifying and directing the signal from the car asking the key fob to unlock.

Of course, ideally they want to break into your house and grab the key.

[beached_whale]

SDR is cheap too, less so for transmission, but still not expensive compared to the cars themselves.