Whenever there is money involved there will be scams... sad fact! I think it will be hard to stop this! Also, excessive supply might become a thing.... but what I think is mainly stopping steemit to grow is the fact that the owners/devs are not looking into improving or creating applications for this platform. Last year on the steemit fest 1 they said that they will only develop 5% of applications/features and expect the steemit community to do the rest. Hope they will change their attitude or the platform will remain the same. Have a lovely day my friend!