Things that if built simply, would drawn new users in by being focused on specific markets:
1. For confessional denominations see Westminster Confession of Faith: WCF In-Line Notes in your Bible! - Logos Forums for user created solution, Confessional Bible Study Filter | Logos for suggestion (there are other supporting functions suggested on the feedback site as well). The Confessional documents are often used in inquiry classes, confirmation classes, and adult faith formation. These are all good points to introduce potential customers to Logos and would give Logos a significant advantage over other web apps.
2. For the Eastern Orthodox which is a growing market in the US, a simple layout of Bible and patristic sermon would support the most common web recommended Bible study method How to Read the Bible (orthodoxinfo.com) (available on many sites)
3. Consider an art oriented method ... think The Word on Fire Bible and Experience Beautiful Christian Bibles and Books | Alabaster Co are recent/ongoing publications showing the interest in this approach.