There is a lot to love about Final Fantasy XIV, and having given the latest expansion some thought, I figured I'd like to share some ideas that would add to the overall replayability of the game as a whole.
While I have a lot of ideas that I want to share, this post is focused on the idea of Savage+ Dungeons and End Game Leves in the game.
1. Savage+ Dungeons
What would the Savage+ system look like? Well, it's a spin on taking the modifiers from Heaven on High and applying them to scaled up dungeons that are currently in the game. There are a lot of awesome dungeons that go unused and the idea here is to take them all and just level sync them up to the current level cap (currently 70, but as expansions are released, they would scale up to 80, 90, ect)... Then, you also take the modifiers that have been released in POTD and HOH and can apply them to the dungeon itself, along with adding in more modifiers. Both positive and negative. Now each time you clear the Savage+ Dungeon you "level up" the duengon and are thus given the option to go back into it and the dungeon is now harder, imagine the enemies being level 71, or 75, 80, etc... Along with adding in new modifiers with each phase, thus pushing players with challenging and repeatable content.
Rewards
Rewards are going to fall into what is most challenging as the game currently only offers tombs and gear, so I think they would want to add leaderboards, mounts, titles, and more to this system.
2. End Game Leves
One of the systems that I always thought could use a horde mode, would be the leve system. Think waves of enemies, ever increasing difficulty levels, and even add in HOH modifiers to the mix. The catch here is that leves happen in the open world, so it would be visable to other players, while at the same time being instanced content. The catch is the leve would allow you to end after any 10 rounds of enemies, but would continue on for as long as you can go, so there would be no end, the enemies would keep getting stronger, and they could pull from any number of enemies or bosses that the game already has... Imagin fighting a version of Alexander at some point out in the open world. The trick here is that the player would use their allowances to do this content, so it would be like a leve that cost all your allowances, so you couldn't do it every week. Along those lines, leve linking would be a thing so you could bring friends and challenge it as any size group up to a full alliance if you wished. The leve should take into account the party sizes and apply that to both the difficulty and the rewards.
Rewards
Being that this content is gated behind your leve allowances, they could offer a lot of interesting and rare rewards because players would be time-gated between trying it for themselves as well as with other players. It would offer XP, tombs, mounts, minions, and more.
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Updated 8/1/2018
Posted a video providing more detail here if interested: https://youtu.be/5lp8xQ5h3g4