Retention is definitely an issue.
I honestly believe that if a large group of us actually "adopted" a newbie it would be far more helpful than the curation trails because it would be one on one interaction/guidance/mentorship. The "Big Brother/Big Sister" can help promote that new person using their influence/reputation to build a solid foundation.

I do believe the curation trails have great intentions but it's like a comet: a bright flash and then it's gone. Newbies love seeing their post get attention and making money (as do all of us), but the curation trails cannot keep visiting the same people. Without being comfortable or established on the platform, the quick hi and bye of a curation trail (and it's associated funds) may feel like abandonment when a newbie's sophomore posts earn next to nothing.