If Abandonia would be an online game (a la World of Warcraft or Counter-Strike), what kind of game would it be? RPG, FSP, Casino games or something else? What would it contain? What kind of characters, classes, worlds, weapons, stuff...etc would it have?

Hmm... That's an interesting question...

I'd say it would have to be a combination of many things.

1) The ultimate goal: gather enough power to control everybody's computers and establish the ultimate game-base (whcich would include every game ever created - prefrebly for DOS, but could be for any machine/any OS).
2) In order to be so strong you'd have to be able to hack other people's computers.
3) The main focus of the game would therefore be the in the hacking and protecting ones self against the hacks.
4) The stronger you'd be - the easier it would be to hack somebody else (because you'd have more power/experiance/options), but you'd be under constant attacks by others.
5) As a small fish, you wouldn't be interesting to get attacked, but would have great trouble defending your self if attacked.
6) You could have mini nets - create different players which you'd all control - and establish the strongest one of them. But if that one falls all would be lost. That one would however be able to use all the power of the lesser ones under its control - so it might be powerful enough to survive an attack.
7) Once you reach enough power, you someone would get into the data base and have all the games (only inside this game) the game would stop. Then you could start all over again. So it would be in the interest of the others - to always gang up on the strongest player (so that person couldn't get into the data base). This would make poeple want to equal out the powers.

It would mostly be a strategy game I guess (sort of like online risk). Whadaya think?

...I'l assume you're talking about Abandonia the site and not Abandonia the forum / community.

Anyways...
I would picture is as Tron online...
Each player would be given one company that isn't esa protected and in order to spawn discs they would have to name abanonware games from that company. Players would then be able to form "clans" based on game type, company, and ESA protection. It would be possible to obtain super weapons (ESA protected games) but then the player with the super weapon would then become "wanted" and any player (including the ESA class which gets a bonus vs wanted chars) can PK them. There would also be dueling in which the players would have to decide on a game and the duel would take place in the game (think Holodeck).

Abandonia is already an online game.

Just look:

Submit games and reviews to gain recignition and thus increase your community status.
Upon reaching VIP, keep being active, since otherwise you may lose it.
Work hard or another player may achieve better results and thus replace you on the VIP position.
Additional goals are: becoming a moderator, administrator or updater.
In each of these cases, you receive new powers but also the challenges are much greater, as with gaining these abilities comes the explicit need to use them in order to protect the site from spam, flaming and similar nasty things.

Too bad you can't cheat or screw up and then load. :P

I wonder what happened to Tai's idea of making game of AR? *goes searching*

Mine would be a game where you would build your own dos game website and make the best one.