First let me get the one that is now literally impossible out of the way: Konami funds a Suikoden 6 (or at least a Suikoden 1 remake) lead by Yoshitaka Murayama. Unfortunately, Murayama has now passed away so this is no longer a possibility. Also, Fuck Konami.
Now for a few that SHOULD be possible based on the Final Fantasy IP:
1. A fully budgeted Final Fantasy Tactics Remake or Sequel. Still confused why the original never got a legitimate followup. One of the best games ever made...
2. A Musou style game based on Final Fantasy. I used to love the old Dynasty Warriors games, but fell off a LONG time ago. Koei seems to put as little effort (and money) as possible in their games and it clearly shows, but that doesn't mean I don't like the IDEA of Musou style games. Having tons of characters and stages to unlock is always appealing to me as long as the gameplay is fun. Final Fantasy in particular has tons of iconic characters that would have vastly different playstyles to mess around with. Tons of enemies to choose from as well. Seems like a match made in Heaven so it will probably never happen.
3. Similar to above, I feel like Final Fantasy would be an amazing option for an Arc System Works fighting game. I see something like Granblue Fantasy Versus and I am like...wow, that looks cool, but it would be fucking NUTS if it was based on an IP that I actually knew, lol. Just picturing some of the iconic FF characters brought to life in those amazing Arc Sys graphics is crazy to think about.
Now for some fantasy land bullshit that will never happen...a couple of ideas based on Warhammer Fantasy. 40K is awesome, but man...my first love was Warhammer Fantasy. Such a cool setting ripe for exploration. Total War is cool and all, but I want something a bit different. Two that immediately come to mind:
1. Ubisoft (yeah, I said Ubisoft) should come out with a sequel to a forgotten little gem that came out a few years back....For Honor. However, the sequel should be based on Warhammer Fantasy. For Honor has some amazing looking characters so they seem like they would be capable of bringing the sick designs of Warhammer Fantasy to life. They also have this amazing animation system in place that allows you to have two characters that are absurdly different in size fight each other and not make it look ridiculous. So you would be able to have a Chosen of Khorne fight a Witch Elf and make it look believable. Anyway, For Honor seems to have been put on a skeleton crew for the past few years and seems to be the only IP Ubisoft refuses to milk to death with endless sequels. We will have Far Cry 17 before we get a single For Honor sequel.
2. So when I play RDR2 I can't help but be amazed at the world they created. Just an amazing achievment from a technical standpoint. Of course, then I get thinking...man, imagine if these guys were put on something like a Fantasy IP? So that brings me to the crazy idea of Rockstar working on a Warhammer Fantasy game. Basically, creating a living, breathing Altdorf from the ground up along with it's surrounding environs. Maybe add Sylvania for some Vampire action. This will NEVER happen, but a man can dream, lol.
TLDR: Fuck Konami