That’s 200 people. 2 groups get credit for a kill. There are 6 level 66 elite areas. That doesn’t include all the level 60 elite areas.
200/10 = 20 different groups that can effectively get credit for each kill. This is assuming all are going simultaneously.
Without counting them up there are probably close to 50 bosses/mini bosses between just the 6 level 66 elite areas. That implies there is over a 2 to 1 ratio of bosses/mini bosses available to the people who could effectively get credit simultaneously.
So unless you half literally half those people sitting in Myrk sitting at the same bosses I think it will be fine.
That being said more areas and more bosses would be nice. But I think we have enough to work with to at least get it started in a different direction