Such a system Yoshi-P has said multiple times in the past he is not interested in creating. Such things he is concerned about are too much pressure being put on healers, leading to wipes and disbands and such if there are mistakes made resulting in failure.

He would rather put resources behind creating things where more people can gather together, such as Baldesion Arsenal, CLL, Delubrium Reginae, Dalriada, etc. where it is ok if some people are less skilled than others. You will more likely be seeing more of these kinds of large scale encounters in future.