Also relying on pilot's for there own VFR separation and mixing that with IFR
is deadly
That is exactly what you have in numerous US airports - A remote radar controller, sequencing IFR traffic into non towered airports (where VFR traffic might be). Works very well, you can fly a precision GPS approach and once visual you negotiate your own landing.
I can't see a problem with it because if weather is below VFR minimums then there won't be any VFR traffic and if it is above minimums you'll be visual well before DH/MDA.