Valorant consists of many different agents with various abilities but the problem arises when some specific agents are way far more powerful than others. One of them, undoubtedly, is Sage and hence sage is surely getting nerfed in following valorant update(s).
WHY SHOULD VALORANT NERF SAGE
One of the most prominent abilities of Sage is barrier orb with slows down enemies push and gives time for teammates to rotate and takes tons of enemy bullets to break, which proves to be a great deal. Sage can turn the whole round around all by herself if played correctly and can even heal a teammate/herself to full health or the resurrection, which revives a teammate. Isn't it like 6v5?
Due to these overwhelming abilities, Riot is so keen to nerf this particular agent as soon as possible and in the most sensible way possible. Valorant lead character design artist Ryan ‘Morello’ Scott said that "Sage is going out of control".
NERFING MIGHT NOT BE THE BEST OPTION
Though nerfing might not be able to perfectly balance the game and therefore Riot may introduce a new agent with counter abilities/whose abilities may be greater then her and sage might be that agent's counter. We don't know what might be Riot planning but they are always creative and astonish us with their updates, like the secret message.
If we talk about nerfing sage, then it might be her ultimate ability, Resurrection. It makes any round turn around completely as a 1v1 becomes 2v1 which is pretty awesome for the sage team but might be seen unfair by their opponent and therefore Sage's ultimate might be the target of Riot's update. But this is not all, Sage has already been previously nerfed in 1.0 update and 1.01 update. It seems like Riot mentions those agents as 'OUT OF CONTROL', who have very high pick-up rate, win rate and I guess user feedback.
THEREFORE SAGE IS SURELY GETTING NERFED BECAUSE OF ABOVE MENTIONED REASONS
OFFICIAL TWEET FROM VALORANT NEWS VIEWED HERE.