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Revealed: car industry was warned keyless vehicles vulnerable to theft a decade ago
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I think the next step is likely biometrics. Using a fingerprint or something to disengage the immobilizer. Having something like a programming key for the vehicle so users can enroll new fingerprints into the ignition.
I don't know, it might be a bit more inconvenient than other options. IMO, they can keep the fob for door unlocking but have another factor for the immobilizer. Both the fob and fingerprint need to be present to engage the starter.
I'm sure it's something that the automotive companies are thinking about.