In my opinion, we should not switch to Scryfall.
The main thing Gatherer has going for it that Scryfall can never match is Rule 108.1 of the Magic: the Gathering Comprehensive Rulebook:
Use the Oracle card reference when determining a card’s wording. A card’s Oracle text can be found using the Gatherer card database at Gatherer.Wizards.com.
Gatherer is the official source of truth for card text, and we should respect that by linking to Gatherer by default when providing card text in questions and answers.
In addition, in the time since the linked Scryfall suggestion was posted, a different suggestion to improve Gatherer links was implemented. That change fixes most if not all of the problems originally referenced as reasons to switch to Scryfall. As a result, our Gatherer links are good enough now that we should not switch and lose the value of linking to the official source of truth.