Threads like this tend to get buried in the regular Bitcoin Discussion forum. You might wish to move it to
Development & Technical Discussion instead.
So this is the BIP that would allow for a standardised currency exchange rates to use in wallets and other apps? I remember back when MultiBit was still a thing and some of the third-party conversion services you could choose from in the settings suddenly stopped working. I can't say I've noticed this particular issue since I stopped using MultiBit, but I suppose it's something that could happen in future with any current wallet, so the idea makes good sense.