That's why new sites may rank worse than old sites. That's the reason for sandbox. They prefere to lose some new sites with good content than have more throw-away domains in the results.
I expect, that Trust Rank will also depend on the age of a site and new sites will have to wait several months before getting it.
It's not nice, I have some sites I launched recently and they have to wait before their time comes. But I launched them some months earlier to give them more time, and the will be finally designed when they will be about six months old, before that, I don't need them to rank well. That's the price of fighting throw-away domains and other forms of spam.
Is there an alternative? Perhaps to make a law enforcing registration of all domains owners and allowing to sue them for spamming? But do we want such a law?