Nowadays it is not enough to accumulate enough activity to get legendary.

If a user is very helpful in exposing scams and doesn't post much helpful stuff, he won't get his merits needed for legendary fast enough.
But such a user is still worth being included into a trust list, which basically means that you trust this users judgement and feedback.

I don't think it is necessary to be legendary to be able to get into DT1. Good judgement and trust is.