They don't need a new airplane; they need a new way to help builders. Everyone I know who's completed an RV in less than 10 years was an engineer or someone else who worked with plans professionally. Zenith is giving their builders a read-only copy of the SolidWorks files for their airplanes. I can't imagine how great it would be to see the parts in 3-D from every angle before putting them together. Almost every mistake I've made started with mis-reading the plans.
For instance, the plans show all kinds of little symbols to denote rivet sizes. Imagine being able to hover the mouse over the symbols instead of having to look back and forth between the drawing and the legend.
Or, how many places on the plans are you directed to look at another view, something like "A-A'?" You should be able to click on the spot in question and drag it around until you've seen it from every angle.
The airplanes are pretty mature, but the plans and manuals are due for some modernization. And that's coming from a guy in his 50's!
I agree that a lot of the people that take on building an RV are engineer or technical types, but the major majority are not.
In fact with the advancements in the later kits, more and more everyday normal people have taken up the challenge than did 15 - 20 years ago with the more basic kits.
That is not to say that there isn't still room to make the kits even better (there always will be), but we are a long ways from them only being built by engineers.