I wonder if there is more that bicycle manufacturers/dealers can do to prevent theft or help recover stolen bikes - not because they're obligated but just to improve sales. Especially as the price approaches four digits, "what if this gets stolen?" has to be near the top of most potential buyers' list of concerns and probably chills sales to some degree.
Mandatory serial numbers, and make it illegal to purchase or own a bike without a serial number, or to buy a stolen serial number.