I have searched and only came up with scattered results on the topic so I figured id gather it all into one topic for easy access by the community.
one of the flaws of the original DBO was the lack of content, this can be argued that it was not live long enough to get Expansions and whatnot to make it grow looking back on old pictures the world map had many places that wasn't actually there just the vacant spot they are a total of 5 spots where nothing exists in the game three on the bottom of the map and two on the top.
I saw a post about adding new races. and one of the arguments was that a new starting zone would have to be introduced. which is fine seeing how the spot for one exists at the top left a perfect starting zone sized map is there just no content in the spot the problem would be modeling and importing all the custom pieces which could take time. Frieza Race ( shitty name so imma just say changelings) Changelings would be a perfect addition to the game ( not right away but once everything else is done )
New skills/abilities introduced into the game ( I saw a post about new skills but I haven't put much thought into it myself to expand on it)
I played the game for along time and hardly ever gotten bored of it but in modern gaming world if it isn't a non-mmorpg type game it requires somewhat new content to be added at some point to keep it alive. there exist so many possibilities for a dragon ball mmorpg and a ton of races/planets to explore.
they are a ton of races in dragon ball from demons to angels, the two races I think most would love to see is Changelings and Androids ( cyborgs cough cough )
as long as dragon ball continues to expand the mmo could always expand itself also. this is something that a lot of people believed was the downfall of dragonball online despite being non global. The developers didn't feel like expanding on the game. to even further this point look what games came out that is pretty much dragon ball online just not mmorpg, Xenoverse and Xenoverse 2 they like the dbo game and story but they didn't want to make it a good morpg. with expanding content and worlds of possibilities.
my hopes is Dragon ball Online Global server revival will soar high and show that this is a game we want, and maybe they will remake it into a better mmo a true dragon ball online. doubt it but always is hope.
( I apologies for my grammatical errors I am playing dbo while writing I've fixed a lot but not all.