I'd be happy if they just gradually add some of the stuff they left on the table in as rewards via other means without doing another full blown crossover
similar to how the pod mount can just be purchased at the gold saucer
especially things that are technically kinda already in FFXIV like the Yorha Flight Unit, 9S outfit, Yorha Heavy Armor outfit, and Red Girl outfit

though I'd also like A2 and Kaine's outfits, and an Emil headpiece (really surprised we didn't get that), and heck all 5 sisters outfits from drakengard3

Also considering how much they mined FF Type-0 assets without much fanfare or acknowledgement (like with how many players I see using the "make it rain" hairstyle I'm sure there's sizable subsection of them that really enjoy it without ever knowing it's Sice's hairstyle from type-0) so I still have hopium that we could get some more Nier/Drakengard items at least but I extremely doubt we'll get another actual crossover event