The biggest worry that people should have here is that the premium currency used to buy the necessary p2w items, L2 Coins, will not be dropping from mobs. This directly translates to the F2p and low spending players having very little, if any, access to the currency that is required to compete.
Farming adena will not be enough for these players to ever catch up, at any point during this project's lifespan. Never. The premium currency that is used to purchase p2w items, L2 Coins in the case of these servers, MUST also drop from mobs. It doesn't have to be a lot, but it has to be enough to pay for 100% rezzes when you die, and enough to feasibly catch up within a certain amount of time.
I have played on 3 different Official Essence servers (known as Aden servers in KR and NA), these being Red, Blue, and Rose. These servers did not have premium currency on mob drop.
I have played on 2 different Private Essence servers (I won't mention names). These servers did have premium currency on mob drop.
I have played on these 5 servers, and I can tell you from experience, the difference between them in terms of the player population and retention, is astounding. The F2P players on the Officials were second class citizens. No chance to ever catch up. They quickly quit the game once this fact sets in, and the server's population tanks and dies. And the opposite of this is true in reference to the illegal servers with premium currency drops.
Just something to think about. That's my 2 L2 Coins.