A new article idea can come from MSDN forums questions, activities going on our daily work, a conversation with a colleague or even from another article or book.
I always maintain an ideas bank for writing new articles for TechNet Wiki or on my own blog.
So, I usually know what article idea is my next one.
Many companies are using such idea management process to achieve their new innovative goals. We also have such ideas bank.
We can put all ideas in a new TechNet Wiki article.
When a community member has a new idea, she/he can add it to this article.
Other member can use it to write a new article and after all she/he should remove the published idea from the ideas bank article.
Have a look at : https://aka.ms/wikisuggestionbox