Mediabase should remain weekly, iTunes should remain ongoing. I don't know how it'd be easier to find information if iTunes was weekly... if it's all in the same thread, you only have one place to look, no? And as someone said, it's not like it's a weekly chart, but 24-hour rolling. At times it hardly ever changes, so staying in one thread is enough in my opinion.
Weekly Mediabase better not change. Because a lot of people may not post in the thread, but simply use the chart updates. I feel like a weekly thread would complicate this.