Zardnaar
Legend
The problem i see is that barring organized play, their is no enforcement mechanism for balance patches. If you introduce Wish the PHB and it's broken, there is no way to replace Wish with Fixed Wish except by DMs to be aware Fixed Wish exists and manually enforce it at their table. The "making the DM aware" is the hard part because Gods know how many DMs bother to check that errata exists (I still have conversations with people who don't know Conjure Minor Elementals was nerfed) and publishing fixes in supplements creates confusion on which version is correct (i believe Goliath and orcs all got multiple versions printed in multiple books on their way to the 24 PHB).
The only way you can enforce incremental change like that is via a digital distribution (like Beyond) where you literally replace Wish with Fixed Wish. Other than that, I don't know how you make it work outside of wiping the slate every few years.
Im not going to use the CME errata until the spell becomes a problem.