Do you think ATC would cope with pilots being unable to accept any instrument approach?
I'm not sure what that question is getting at? They cope with VFR traffic which can't accept any IAP?
I think that's quite different to having traffic which can in all cases fly the ILS down to 200ft (or whatever), and with nearly all CAT being able to fly it even lower
But there can be a lot more variety in the RVR minima for different operators, and all sorts of things limiting minima lower than 200', and all sorts of things limiting minima on an NPA. Again, why is this a problem for ATC?