Broken Speedo Cable - Problems till Replaced?

A buddy snagged his 1999 XJ's speedo cable and broke it this weekend. What problems will this cause until it is replaced? Obviously the computer won't know how fast the vehicle is going (and neither will the driver ), and the cruise control and odometer won't work...I think that's all correct (yes/no?). Are there any other problems or issues pending replacement?

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A 1999 XJ doesn't have a speedo cable. It has an electronic speedo and there's nothing coming off the speed sensor at the transfer case except wires. Is that what he broke, or is there some misinformation involved here?