I've wondered as well if a fully electronic age for tickets will limit the segments on an RTW ticket. And the problem can be more substantive than 20 to 16. On my last RTW, the computer believed I had 26 or so segments, because I had a number of open jaws. For example, I flew into San Diego and out of LAX. I flew into LHR and out of LGW. I flew into Ayers Rock and out of Alice Springs. It will be quite worrying if we get limited to 16 including open jaw segments.