Isn't GPS's role in VFR navigation same as in IFR? It can be primary source of navigation, but not sole source. I really don't think how GPS or VOR/DME/NDB primary navigation while VFR is illegal?
My opinion is that using only GPS while VFR is illegal - but in order to do that you would have to fly under the hood, which wouldn't be VFR for that matter.
Just try to answer the following then: how would you (only by means of DR) positively identify a VFR fix over water that is only based on coordinates (and can be located via VOR/NDB radials and DME)? I imagine it would be very difficult. Should we just ban VFR over water, just because one cannot use DR to navigate?
Besides, this topic is drifting sideways...