@tina The only thing good about Ning 3 is the ability to have multiple feature instances. So you could have customizable feature settings for each with individual page layout controls as a list in a pages navigation builder section of the website. Coupled with a custom design studio, your website looks great on any device as it is responsive, retina, mobile and touch friendly.
Displaying websites and editing templates is one thing. But making them unique is another altogether. Feature, or module instances would make this possible. Do you think it is a good idea?