There is no definitive answer to this question as it largely depends on Riot Games’ discretion and how much effort they feel is necessary to keep the game running smoothly. However, based on anecdotal evidence and player feedback, it seems that Rune Slots are not currently being added to the game with any frequency or urgency.
This could mean that Riot Games does not believe that there is a large enough demand for more Rune Slots in Lol, or that they are simply not able to add them in a way that would maintain the game’s balance and fairness.
The lack of Rune Slots in Lol does not necessarily mean that players are not interested in them; it could simply mean that Riot Games has not found a way to make them a profitable addition to the game. Alternatively, it is possible that they are waiting to see if another game with a similar mechanic (such as Fate of the World) becomes popular before deciding whether or not to add Rune Slots to their own title.
In either case, player feedback will be an important factor in determining whether or not any changes are made to Lol’s rune system.
