Once again I came up with another idea that I had to offer to you guys. Why not add an option to Membership levels where you can automatically protect posts older than the time period the admin sets in the box (ie. 7 days, 2 weeks, 1 month, 2 years)? This would work well instead of having to choose which posts to protect after you create them. With this idea, posts automatically older than the time period specified would be visible (or not visible if using negative rules) to the level the rule is apart of.
What do you all think?