They don't care. I think right now their priority is to secure whatever audience they can, see if it's worth it to keep a store and then build something people would actually want to use. The only problem is, I'm not sure Epic has a long-term commitment to the whole thing.
I think they will have some level of commitment but my main issue is how dependant they seem on Fortnite money to push their ventures.
Right now they have slashed both Unreal Engine and Store fees to really low levels in order to increase their dominance in both fields, but how commited will they be to maintain that if/when Fortnite starts slowing down. Putting all your eggs on one basket is never that good of a solution.
I also think
JaseC is wrong: Epic cannot afford to increase the 12% cut in the store. Their whole PR and key idea is "a better deal for developers", backtracking from one of your core concepts is pretty destructive to any product.
I have already made the calculation in another thread and the question in the end is, if they are making less than 5% on any UE game sold in the EGS (less than they would on Steam or other store!), would they really care about the store that much? Or will it be another Origin when after the 1 year push it is put into near permanent legacy mode.
From their comments, it seems like they believe once these changes are made, they would be good enough for customers not to care, so permanent legacy mode seems likely. A stagnant store is going to fail badly.
My main guess is them trying to utilize the store as a way to get into the Android market (and maybe even in the streaming market), but I am really not sure how many people would start utilizing the app for that when even Amazon failed in getting its foot in Android Stores. Fortnite would need to still be massively culturaly relevant in 2 years for it to be that succesful, and most products nowadays are not that long lived (at that lvl of popularity).