The big deal for most players will be convenience. Being able to buy inspirations and temp powers without searching for a vendor can be VERY convenient. But there won't be any such things in the store that you cannot get in the game.
That said, it is likely at least two years before a cash shop makes it to the game.
There will be dust farmers filling the chat almost from the minute the game starts. Ace was simply stating that if you want to beat them, maybe putting a way to buy dust in the cash shop would be the way to go. SOE did something similar with some experimental EQ2 servers, allowing players to sell stuff for cash on a special auction house. It actually worked, as players undercut anything the farmers put up, making these servers worthless for running a 'business'. But as the game wound down, these were some of the first servers to be eliminated, since they had to hire extra mods to keep it clean, and SOE was trying to sell their assets. If you want to sell a virtual business, you need to keep your overhead LOOOOOOWWW...There was the auction house. and frankly I think SoH should get in the dust for cash market before the spammers do. it will keep a lot of the spam out.