Actually Isen is not dying, you can see lot of PPL participate in first set of PA considering that others have problem because of time frame. And almost 70% of population in Isen are PH and other PPL with different time zone experience the emptiness of server. The time when they are logged-in the others are sleeping during that period..
But I still prefer if Jainus and Isen to be merged.
In new map there are selected spot that can be farmed, other spots are impossible even with complete supports in party. I tried my Predator to farm in solo using Nurse Silva Pet and I was surprised that my character survived there (only selected spot in New Map). But of course with complete supports in Party is way better and I have them all in my own party. Nevertheless, the monster in New Map need to reduce 50-70% of their damage to be able to farm in other spots and complete the required fragments for new weapon.