At any rate here is some of my previous story line round-ups. Below I'll recompile this list plus add stuff from prior to my odds-making and recent 5E adaptations all put into some sort of chronological order.
Closest comparison 1E inspiration: Dragonlance series? / 5E: Hoard of the Dragon Queen/Rise of Tiamat
1E inspiration: Temple of Elemental Evil / 5E: Princes of the Apocalypse (by way of board game)
Closest comparison 1E inspiration: Vault of the Drow/ Queen of Spiders? / 5E: Out of the Abyss
1E inspiration: G1-2-3: Against the Giants 5E: Storm King's Thunder and Tales From the Yawning Portal
1E Adaptations: Hidden Shrine of Tamoachan, White Plume Mountain / 5E: Tales From the Yawning Portal
1E inspiration: Tomb of Horrors / 5E: Tomb of Annihilation and Tales From the Yawning Portal
2E inspiration: The Ruins of Undermountain 5E: Dragon Heist/Dungeon of the Mad Mage (COMING SOON)
What's left to use in 2019? Here's my new odds for future reference.
The Rod of Seven Parts/ Odds 3:1
My hands down favorite right now. This epic boxed set has just the right components for a D&D mega event. It has extra-planar monsters, a backdrop of the war between Chaos and Law (implying use of the new MToF if you change this to the Blood War) and it has an iconic multi-part artifact quest which could easily span two books.
Gates of Firestorm Peak/ Odds 5:1
Staying strong on my list, this weird module is by fan favorite Bruce Cordell and involves the Far Realms which has sort of been brought closer (pun) since the publication of MToF. Firestorm Peak would make a good alternative to Barrier Peaks. For bizarre monsters you can't do much better than this one.
I'm moving this one up my list. D&D may soon need to tone it down and have a more "ordinary" villain to confront players. An evil organization like the Slave Lords can threaten a wide area and could easily be adapted to be something like the Zhentarim.
The Dancing Hut of Baba Yaga/ Odds 12:1
Even though Paizo recently covered witched in Reign of Winter AP, it is not outside the realm of possibility for Wizards to also take PCs on a planar hopping trip in her endlessly fun hut.
WGA4: Vecna Lives!/ Odds 12:1
This is one of the strongest Greyhawk modules still out there and it hasn't seen a sequel since 2E. Since they've recently used Acererak for ToA I don't see this coming soon, but Vecna does have ties to both Planescape and Ravenloft making him a strong candidate for a story line.
Dead Gods/ Odds 12:1
I think this Planescape adventure (or any other really) might be in prime position for a rehash given recent releases. Out of the Abyss has shown WotC isn't afraid to use big demon-lord type of villains.
Forgotten Temple of Tharizdun/ Odds 15:1
This theme would be Lovecraftian horror, nominally set in a dungeon but could be branched out. Big-T and his cult is definitely an uber-threat to the world, so why not?
S3: Expedition to the Barrier Peaks/ Odds 15:1
The crashed spaceship theme was teased years ago by Chris Perkins' when he tweeted a picture of a Froghemoth. This turned out to be for Volo's Guide to Monsters. Would Wizards really jump the shark and mix scifi and fantasy together this soon? I'm not as sure as I once was.
Five Shall Be One/Howl From the North/ Odds 20:1
I adapted this one to 5E for my home game, but gave it a pirate twist instead of barbarians. The chances Wizards takes up this specific 5 part magic sword quest seems slim, but they should do the theme because it would be epic and everyone loves swords.
Jungle based adventure was off 5E's radar until the Tomb of Annihilation but I still give these type of stories some value. There is certainly plenty of tropical monsters in 5E already developed to cover this kind of story.
And lastly, for fun....
The Doomgrinder/ Odds 1000:1
Don't even ask.