The errata has already seen some longer than one-line fixes, but even so I do not see it as something that would necessarily require very much in terms of added or changed text: I agree that it is not a simple typo. But on the other hand I don't think is a change in system, and thus requiring a new edition or to be put in a published book.
I have nothing on which to base my assumptions but it seems to me that for now 5th edition isn't headed for a Grimoire - partly bc many of the issues are now addressed in the core book or, as someone pointed out to me in another thread, they have been given room in some of the suplements, and often with more emphasis than earlier.
Now, let us not argue and fuss - this debate has already been exhausted quite a bit in the Battle of the Bulge.. I meant to say Creo Cheese! But I will agree to 'what you think works best for your saga' 