My prediction is we're gonna see gambling in TOR few months after release. Basically after the game has established itself and the success has been confirmed, they can start working on it. Since it is not overly complicated to do, they might give it a high priority.
They will never allow gambling in the game, they would have to change the ESRB Rating(insert other rating boards here) let alone that most governments dont allow online gambing or have extremely specific rules for it regardless it being for an ingame currency.
Well actually teen is all that is needed apparently because Final Fantasy XI has known gambling game around. There are tables in the first major hub city that all you to play a high low game for gil. Also there is a yearly lotto that if the right collection is had in your inventory you can when anything from gear (mostly aesthetic) to millions of ingame currency. Gambling in of itself is not enforced in the digital unless real money is used. For instance Mahjong arcade games have been around on NES for years were you have a pool of money that is bet to get into hirer games. Now sure that is solo but the same principal can be brought to an mmo. The only digital currency law in effect i believe is in China were it is illegal to exchange ingame, digital, or fictional properties, currency, or services for money (I am assuming because you would not be able to tax appropriately). But other then a persons/society moral standards gambling in the digital sense is no more illegal then playing poker at your house with chips that have no value.