@mechaspooky @thebirdroads Oh, it'll be fine, but I don't think Fallout will go beyond Bethesda again, and certainly not to Obsidian— Chris Avellone (@ChrisAvellone) April 10, 2016
Further controversy unfolded when it was revealed that Obsidian missed out on a bonus payment that was north of $1 million that they would have received if the game had scored just one percentage point higher on Metacritic. The fact that the game became Bethesda's biggest-selling-ever title on release, shipping 5 million copies in its first month on sale (almost double Fallout 3's first-month sales), was apparently not rewarded. Bethesda's next two games have sold more, Skyrim shifting 7 million copies in its first month in 2011 and Fallout 4 almost 12 million last November.
Despite these issues, Obsidian did propose a new Fallout project to Bethesda a few years ago. This game would have been set in Los Angeles, expanding on the Boneyard setting established in earlier games.
However, whilst Avellone's remarks might be misconstrued as Bethesda becoming more controlling of the franchise or petty over past criticisms, there's actually a far more practical explanation. Outsourcing a game requires close coordination between the IP holders and publishers, and the whole production studio. In New Vegas's case, this required Bethesda - based just outside Washington, DC - and the LA-based Obsidian to coordinate development which ended up being less practical than expected. Bethesda, more likely, will want to employ their own in-house secondary team to create games at a faster pace, and last year they announced the formation of a new team in the (relatively) closer location of Montreal to do just that.
Bethesda have hinted at some major announcements at E3. It seems unlikely that The Elder Scrolls VI will be announced so soon, so it's more likely to be about games under development from their other studios.
Chris Avellone is currently at Larian Studios working on Divinity: Original Sin II. Alongside the likes of Patrick Rothfuss, he's also contributed writing and story development to inXile's Torment: Tides of Numenera, which should be released this summer.