i think that an inactive DT member should be removed because if a member can stay out of the forum for over 5 years, what will be the probability that they will come back to the forum someday and still maintain same level of reputation that got them trust from some DT members?
They cant be removed, just like one day you may also be one of them and have some reasons to be off the forum, either to come back or not, should everything left on you be rendered useless?
Perhaps, for those who made it clear they won't return to the forum again, what is the essence of still leaving them in the DT? besides, the positive trust feedback from other DT members should be enough.
I DT member returns or not should not be our priority, he have his own personal reason for going off the forum and being inactive, if he comes back dine, if he does not, it still change nothing from the ratings or review made by him, once he has a good and clean purpose, then the judgement made will always be relevant whether he is here or not, take for instance Leo, who left and should we say because of this, his reviews are no more valid or accurate?