I definitely don't think that increasing the time limit entails less work for the RG and I've said as much earlier. It would though provide a serious consequence to people who deregister, where at the moment it's not really that serious.
If there was any evidence that even some people who deregistered were people who were planning to fade into inactivity and never come back then that would be one thing, but I don't think that's ever actually happened. The only people who deregister are those who are going to participate again almost straight away.
Again, what is the downside of people deregistering and returning soon afterward? You previously claimed it overburdens the RG but Fritz has denied that so I see no actual negative impacts of deregisteration.