i think that if they later want to combine the server with the original one that is unfair for the people that in the new server because the level of the orginal server will have the higher level and it was not fair to the new server i think they will not combine them at all
It won't happen shortly. The server can be combine only when many players have been 100LV or even better. To combine the new server with the existing server too earlier will just kill the new server. Because the new user will pay the current users for up level and finally all users will just stay at several areas only and nobody goes to low level areas. This will ruin the game quickly.
To make the server last longer, I would suggest Runup to cancel the Fairwood Heungs or the Tsui Ling Heungs which force players to up one hour every time after taking. For the most experienced players, I think you must remember how happy we are in the very early time when there is no Heungs in Mystina. Players up level whenever they wished and take rest whenever they wanted. This can be easily achieved in a new server by adjusting the "EXP".