After removing Split from the Competitive map pool, now Riot Games is thinking of reworking Fracture, another Competitive map that usually favors attackers rather than defenders.
Recently, Riot Games added Pearl as a new map to the game and the Competitive map pool.
Also, the developers have not revealed any plans for Split after its removal from the Competitive map pool.
Probably, Ascent could be one of the top candidates to get removed from the Competitive map pool if any new map arrives in the future.