How about a toggle in Luci to switch between Basic and Expert, with Basic being a stripped down version of Luci that is only concerned with common home network configurations and Expert revealing a larger set of configuration options?
Basic mode could also have some scenario driven wizards for common uses of OpenWrt in a home environment.
I could also see two different builds for OpenWrt, Compact for limited resource devices and Expanded for devices that have more disk/RAM. It is a core goal of OpenWrt to support devices that have limited resources, however, there appear to be many users who are happy to spend extra on their device and thus have more resources to take advantage of. It would be nice to see a build reflect that.