"But you're reading it? Sweet, thank you. Luckily, I don't write for you, I write for me. Whether you publish it or not, you should write for yourself as well."
Writing out your ideas, your plans, your schedule, all do wonders to organize, and overcome roadblocks that you may not have realized were slowing your brain. Writing doesn't just help you communicate outward, it helps organize your thoughts, emotions, and process the events of the day.
I've gone a month without writing and it has slowed my thought process, problem solving, and my communication. The side effects trickle down into every other aspect of my life. I wouldn't recommend it. This post, which would have normally taken me about 15 minutes, took 45.
Side note: You are never going to run out of good ideas. However, if you don't write out an idea, a plan, an invention that is unfinished, even if it's to come to the conclusion that it won't work, you may never be able to start thinking of something else, or fully commit. Your brain and emotional effort are still being syphoned off. How many great, life altering, world changing ideas, have you missed because you can't get passed something that isn't going to come to fruition?