You've been saying "its the best full loot game out" since it was the ONLY one out... lol not hard to be the best when you're the only one.
Mortal Online is now it's completion with more coming out with in the next year. It is really sad that it was the only FFA PVP full loot game out for such a long period of time.
These types of games will always have small population's, people don't like loosing there loot or not being able to show it off with out risk. It is also a game centered around PVP the general population wants more fluff(PVE, Roleplay and Chat interface).
I consider EVE to be the most successful game with a similar rule set but not in the genera. They had a massive amount of people purchase there game and had a launch similar to Darkfall's that resulted in a major loss of subscriptions. Overtime they patched the game and kept making improvements it now has 250k+ subscriptions. This is no comparison to WoW but no FFA PVP Full loot game ever will have WoW numbers.
I think Darkfall could easily follow that model and continue to grow.