I was thinking the game will loose me more or less when (if ever) I get the Lunatics Story beaten, since the special ultra hard Quest last weekend for the mad axe wielding jerk on a fliyng lizzard needs ubercharacters to get done (all 4 must survive -.-) and if thats the skill/investment level they strive for as High-end content it would be above my maximum acceptance level of grind or giving in to F2P just to get there.
And if that is the only way to get decent 3* and 4* outside of pulls it would loose much of its appeal. But seems i have underestimated their other ideas.
The recently introduced Sword, Axe and Spear Mastery Quests. This quests and some other rather hard ones keep me quite heavily invested. If there are Sword, Axe and Spear masteries I think there would soon be Red, Blue, Green Tome, Bows, etc Masteries as well...this helps to keep me occupied...so much that a game which only should have me playing it for 15 min while commuting keeps me busy the whole ride....now I don't have time to read books, watch movies and play other games on my iPad anymore...since I commute 2,5 hours a day this means quite a lot of time occupied by FE:H.
Only thing I dont like about the Sword,Axe,Spear Event is that it is rather short - as in ends in a week.
But now I have something to do with my "useless" 3* Swords, Spears and etc. Characters as well, levelling them up, trying out their skills etc. to get them up to have 4 of every class.
So long story short...the longlevity of this game seems pretty much given as it is right now.
Also aside from the FE:H Wiki I also want to highlight > Serenes Forest, pretty much THE Site for all things Fire Emblem in the west. I was going there for ages for tipps, stats etc for every Fire Emblem game I played.
I only startet using the 2 Fire Emblem Wikis (not the same as above this one above is just for FE:H) with Fire Emblem Awakening due to all the nice lore info as well as support conversations for all characters was on the wikis and since I love em talking heads in FE....