Members can make their own trust lists, and I would wager that most users who have been around here for more than a few months (excluding the signature spammers who probably don't even know what trust is) do exactly that. I would be against scrapping default trust, as I think it is probably most useful for protecting newbies and junior members who have not yet decided who they would and would not trust themselves, and these junior users are the the ones who are most likely to be scammed.

I do however agree that a handful more DT1 members, and therefore more active DT2 members, would be a good addition to the trust system. Also removing the inactive members would probably be a good idea too. For example:

xkrikl - Inactive for 4 years. Only feedback ever left is a positive rating for one of the biggest scammers ever.
Tywill - Active for a grand total of 27 days in 2013. Only feedback ever left is a negative against a similarly inactive account.
sayulita - Inactive for 9 months. -2 default trust as potentially compromised. Total of 2 feedback left.
teukon - Inactive for 2 years. 1 feedback left.
ioxoi - Inactive for 7 months. No feedback left.