When it comes to blogging, the hard part doesn't have to be the thinking and writing. The hard part could be taking some kind of action and then writing about it later.
Consider the polyphasic sleep and raw food diet trials I did. The thinking part was pretty easy -- other people inspired those ideas. The writing part was time consuming but still easy; I just logged what actually happened. The hard part was running the experiments. Any blogger can get the idea for these experiments. And anyone can log their day-by-day experiences. But relatively few will be in a position to actually run the experiments.
Even consider a simple article like
How to Become an Early Riser, which was my first real blogging hit (7-8 months after I started blogging). It's about 1,000 words of fairly straightforward text, and it only took me an hour to write. The hard part was the years I spent trying to master this habit and finding a solution that worked for me.
You can get a lot of mileage in blogging from figuring out what would be interesting/helpful/important to read about but which fairly few people would be willing or able to do.
A lesson I learned from my time participating in a local improv troupe: If you're clueless as to the best way to act out a scene or character, go big! Aim for big gestures, exaggerated expressions, and over the top act-outs. Even when you miss the mark, the result is usually fun for the audience to watch.
The blogging equivalent of this is that if you have no interesting ideas to write about, go big and create your own news.