Sunny I think your concerns are quite valid. As light aircraft get more sophisticated pilots will assume that the box will take care of them. Its a problem that is still being addressed by the airlines worldwide.
There will always be the clever dick who thinks they know better than the system and devise their own procedures, you just have to look at the Mt Hotham prang for evidence of that. They get away with it several times and then think their knowledge and the equipment on board will keep them out of trouble.
The problem with this thinking is that at some point the aircraft will have to be handflown in marginal conditions. No amount of electronic wizardry will save you when spatial disorientation takes over.