It would be better if we could have the same system with default trust members, many of them are inactive,
That would significantly decrease the weight they've given in their feedback, which is not necessary even if those members are inactive. I would say that as long as it's not suspected that the account has changed hands, no action is necessary. In other words, just because someone hasn't posted here in a while doesn't mean they're not trusted anymore. On the other hand, if an employee fails to do work for X amount of time, it's only logical that they should be let go.
because IMO trust system is more important than moderators
I don't think so.