Hi, great article and good points. It will take time to Steemit have more users, but I am optimistic here. With some more implementations and upgrades, people will find their way to Steemit. At this point, I see it a little bit confusing some things, like having multiple keys and passwords which needs to be stored secretly - that is a problem for many ordinary users of fb. They can lost their password, they can use simple password and if they lose their fb account (or is hacked), they just make a new one. Here, while you have some STEEM / SP / SBD, you need to be more cautious with your data. And that is what most people don't handle.
Also, some kind of a chat (like fb messenger) might be a good thing which could help the UI. There are still some things which need to be done here.
Permanent public file storage seems like a no-brainer to me.
If someone told me, you can post any file permanently and publicly as long as you have enough steem-power, I think steem would be front-page news world-wide.
The password thing is somewhat of a concern, but I'm sure someone could make a front-end password manager that would let people use the passwords they're used to.
And an integrated private chat/mail/message feature would definitely help facilitate commerce.
Thank you for sharing your insightful and original ideas!
No problem, that is my view.