If you have a relatively large userbase, I would be hesitant about changing too much too fast. I would set up a poll or discussion thread in your site's news b

If you have a relatively large userbase, I would be hesitant about changing too much too fast. I would set up a poll or discussion thread in your site's news blog to get a feel for how your suggested changes would be received. If they like it, go for it. If they don't, find out why not. However, changing one thing at a time is a good suggestion. Adding features helps improve the usefulness of your site and allows you to appeal to a broader audience. And if the users hate your new addition, they will sure as hell let you know.