I would say maybe 2022 for FFXVI BUT I hope it's a 2021 title. Square needs a mainline title to push the franchise forward, and while FF7R is immaculate... There's only so many new story opportunities they can take, they're limited in that aspect (for example, just how polarizing the ending was when the game first dropped).
KH4 or (maybe Verum Rex) would be dope for 2022 since Nomura's alluding to something big that year. And it would be nice to kick off the next saga with a numbered title as soon as possible. Either that, or it's a fully fledged Dream Drop Distance II style game with Kairi and Riku as the protagonists. Melody of Memory should give us an idea on what to expect. Unless KH4 will involve us rescuing Sora (which would be a really cool idea if Kairi's the protagonist), that's gonna have to be touched on before the next numbered title happens.
2023 for FF7R Part 2 is likely as well, if not late 2022. Even though they have all the assets in terms of the characters and a lot of the base work is done, there's still the matter of the world map to figure out, as well as how many parts the series will have (let's hope it's mainly three). Anything longer than 2023 and I'd be concerned.
GoW, yeah, it's possible. We're in COVID season and we saw just how delays really hampered development all across the board, so it wouldn't be a surprise if we don't get a release date come June 2021. COVID isn't going anywhere, BUT people may be more adjusted to their new workflows by then, so hopefully we won't have any more nasty delays (looking at you, Cyberpunk 2077
)
The FFXV team is handing Project Athia, and they've been working on the Luminous Engine for quite some time now, so the hope is that PA has a much smoother dev cycle and there's a clearer vision in what that game is supposed to be.
Everywhere I go, I'm hearing the story content in FFXIV is the best in years (even apparently Classic Era status), so from what I'm gathering... This is the absolute dream team for a Final Fantasy game. I've been meaning to jump into the story content for XIV for quite some time now, actually.