It usually goes without saying that the more successful a game is, the more DLC it will get. In this case BioWare’s Patrick Weekes is coming out and saying it on Twitter.
future DLC plans of any kind depend upon success of Leviathan. If we see that people want SP DLC, can always make more. 🙂
There’s a lot of loose ends floating around in Mass Effect’s story other then just the endings, so it would be nice to see them work on some more single player content. With the disappointment over the original endings, and no paid single-player DLCs since launch it’s hard to gauge if people will be willing to cough up the cash.