Actually, joystick drive-by-wire systems
have been on the market for some time now. These systems are often installed for people with disabilities who cannot manipulate a regular steering wheel. The vehicle modification industry is a mature market with its own
national association.
This concept vehicle addresses one of the core problems - cost. A typical vehicle conversion can run well upwards of $20k (in addition to vehicle cost) and involves massive hardhacking of the vehicle itself. You're pretty much stuck with the vehicle until it dies since you won't be able to sell it. It is far better to have an OEM route.
In terms of safety and control dynamics, I'm pretty comfortable that these are surmountable issues.
- First, most people who currently get a joystick system receive dedicated training by a certified driver rehabilitation therapist (CDRS). I would imagine that lessons learned in this field could be distilled down into a more generalized training approach for populations that don't have the severe dexterity impairments present in the current user base.
- Second, the years of experience in the vehicle modification business is a good start towards safe control dynamics. Advanced vehicle control systems are the next big leap and are far better than they were even a decade ago. Paired with systems like lane tracking, stability control, and forward ranging systems, it would be quite possible to put a layer of "smarts" over the command inputs.
- Third, removing the steering column makes it a lot easier to protect the driver in the event of a crash.