You are right,
many of the people who leave the Steemit community
had completely unrealistic expectations coming into it.
The fact that they were disappointed has nothing to do with Steemit,
it has everything to do with them.
If it were not for Jerry and friend giving people an unrealistic representation of what Steemit is, their expectations would likely be more realistic. If they leave, let them, perhaps they will find what they are looking for elsewhere, let them leave Steemit to those who love it, flaws and all.

I totally agree with you, everybody needs to engage the newer users, even those of us with little SP. More engagement cannot hurt.