I like the idea, but to echo another comment, the hardest part of running a blog is not selecting the blogging engine or how to host it. The hardest part is keeping new posts flowing through the engine.
What blogging platforms focus on this side of things? Which ones help solve the "What do I write next?" problem?
If you have nothing to write about, you should not write; Not write about nothing.
You should write about nothing though, it's a good writing exercise. Just maybe don't publish it? Publish what you write after that, when you know what to write about.
What blogging platforms focus on this side of things? Which ones help solve the "What do I write next?" problem?