There will be future support for Ray Tracing on RDNA cards. Big Navi so far is the only future card I know of that this is officially announced but they have said for a long while now it is coming. Until it is released we won't know by comparison how effective it is.
Actually to be more specific it will be RDNA2 that will likely have this support as only one card has officially been announced it is unknown if the full line will. Speculation is though that they will and may be available in June of 2020.