I had this concern because I don't like NTS only NTR, so I asked him on the Japanese tuition site, and he replied saying that the routes will only be very close to the end of the game, and said not to worry therefore. So I can understand that we shouldn't worry if the game will change the pace, it should continue like this until very close to the end and getting close to the end (maybe 1 or 2 updates before the end) it should do both routes just to give two endings to the game, I don't think these routes will be big parts of the game, I think they will be just to end the game, one Kirito being Netorase and the other Netorare.