There has been a relatively small number of people rank up to above Full Member (not all that many people have ranked up to Full Member)since the merit system has been implemented.

I am curious to know if you have any measurable stats as to how many higher ranking accounts have stopped being active over the past 18 months.

I don't think this will do anything to correct the DT system. Most people, even those with custom lists will use DT scores as a baseline for trying to determine someone's trustworthiness, and ability to participate in advertising campaigns.