Go For it!
I dont see any issue with the game style if the servers were to merge aside initial complaining of overpopulation of junon. The market pricing would be messy but it will pass once players settle down.
The issue with character with same names could be solved by adding a "D" and "L" to their names. Ex:
Draconis player: CalanorD
Leonis player: CalanorL
Then a ticket ought to be sent to the support team to request a name change during a period of time after the merging to have the L or D removed and goes to the first come first serve. Of course, The players must be aware ahead of time of this matter so there wont be complaining later on.
As for Storage issue, there's storage and the premium storage. Have the items of either Leonis or Draconis storages stored in the premium. Or just add more tabs to the storage.
Personally, I welcome the idea of merging servers with open
So I'd say it again: Go For it!
PS: No matter what people will say otherwise, Draconis server is more stable than Leonis. (old hardware perhaps? or its just due to having 2 servers takes toll on the connection.)
PSS: Add additional farm/level spots here and there, to lessen the pressure and the monopoly of popular mob spots. As well to advertise and encourage the populace to explore the less crowded maps like the marsh in eldeon and luna maps in general.