Your platform looks nice, but I think the business model that drives it will need to be rethought.
One of the issues here is that the problem you're attempting to address has already been solved.
The technology barrier to self-publishing is already low enough. No disrespect to non-technical people, but if you can't figure out how to set up a Tumblr blog, then there are larger issues at hand.
In other words, you can keep lowering the barrier to self-publishing, but eventually you're not left with much of an actual business. I think criticsquid's reply said it well; there's a huge difference between simplicity and lacking in features.
I think one direction you might look into is selling yourself as a discriminating/curated blog platform, much like The Deck did with their curated Ad Network for the creative industry.
At any rate, you need to add some value here. At present, I just can't (personally) see any reason why I'd choose your platform over the other options.