Originally Posted by
DaveReidUK
MLS (microwave) and RNAV approaches are gradually supplanting ILS, though the latter will be around for a long time yet.
If gradually supplanting ILS means at an absolute snail's pace then I'd tend to agree with you but, in reality, the only true statement there is the second. As you know, RNAV approaches are nowhere near as accurate in terms of altitude, which is why they have higher minima and decision altitudes. Additionally, funding for the MLS is rumoured to be about to be discontinued at Heathrow.