I'm puzzled by why you would make that prediction. Over the past 20-30 years there has been an ever-growing crop of "higher-end" homebuilts. In fact, don't I recall reading that there are more homebuilts added to the GA fleet every year than production aircraft? I would guess that for every lower-end scratch built plane completed, there are a dozen or two that would qualify as other than low-end. It seems like that trend has been increasing, not decreasing.
Or am I just misunderstanding your position?
Measure twice, cut once...
scratch head, shrug, shim to fit.
Flying an RV-12. I am building a Fisher Celebrity, slowly.