I have some thoughts that I have come to mind about the LCC and progression.
I am a member over on Eurobricks and in the Guilds of Historica, although my building has practically been isolated to the LCC. Something that really intrigues, and could be an option for the LCC, is the breakdown of "Books" in the GoH. In the GoH, they have each part broken down into "Books," with various challenges encompassing the chapters within. At the end of the first book, they allowed people to move to different factions, took a break, and planned the next book (which is incredibly sweet). What this did, was give builders a break, allow them to change to new factions, have everyone start from scratch (while keeping whatever aspects of their character they wanted), while advancing the story.
I realize we are different from the GoH but there may be some options we could employ here in the distant future.
We could have something similar called "chapters." Within each chapter there are 6-8 Global challenges. At the end of the chapter, we take a 1-2 month break, where we start clean, and people are allowed to make new characters in new factions. In that 1-2 month break, FO's and FL's can step down (if they desire) and they can be replaced with new ones (so they do not get burnt out). If characters wanted to join a new faction, they could do so while deleting their old character. Old characters can stay in their faction, with their storyline and whatnot if they so choose. The faction that was in last place could have a distinct advantage in the next chapter.
So ultimately, the LCC would be one big "book," and each chapter would tell 6-8 (or however many) large events that took place in the book.
I realize, that we are not the GoH, but I know the GoH gave us inspiration in the first place!
Also, something that could be considered in the future, are additional guilds.
Personally, the thought of some guilds (such as, but not limited) could be...
Thieve's Guild - with the last challenge performing the "ultimate heist"
Fishing guild - starting with "the one that got away" and ending with something of epic proportions!
Miner's Guild- Uncovering a vein of gold, all the way to starting a mining business! (eh, lol)
Hunting Guild - starting with trapping a small critter to hunting down an epic creature
Warrior's Guild - this is different than the hero's guild. I see the hero's guild as more of an adventuring guild. This is a guild focused on combat. Starting with sparring and ending with an arena warrior of sorts?
Archery Guild - Starting with crafting an arrow and going all the way to winning huge tournament's!
Blacksmith's Guild - crafting a sword, finding materials, to kingly helms!
Alchemist's Guild - finding materials and crafting potions!
Bard's Guild - composing a song to playing for the Queen!
Those all just came to mind, and could be something to think about. Diversity is always good
It could even be cool if there were faction specific guilds - Only members of a certain faction can join a certain guild and even have things like prestige guilds! Each guild could have two different options for a prestige guild, and you could only choose one.
Outlaws - Thieve's Guild
Garheim - Fishing Guild
Lenfald - Hunting Guild
Loreos - Something for their specific industries.
These are all just some suggestion of course, but may be a way to help break down the LCC in terms of longevity, and also give those who are wanting a faction change, time to do so. If there ever is any kind of advancement in the guilds, I wouldn't mind one bit to help out