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Regarding the questions, every member who is a DT today was once a Newbie. He didn't come here with all his reputation already, he was building it every day, contributing in some way to the forum. So, yes. Any member can become a DT.
Of course - all users here started from brand new with no contributions. Over time, they built their reputation by contributing to many things - including being a cheater hunter. But should everyone be racing to become a DT?
I don't know what the main motive is for new users to become DTs - but sure enough, any user can become a DT as long as they are included in the DT1 trust list. So - if they want to be DT, then make good contributions and be useful users. DT is not always about contributing with quality posts or being a cheater hunter - but there are many users who tend to make transactions involving money who are also DT. They are on the DT1 trust list because of their honesty and consistency in making safe transactions between users.