Former Mythic Entertainment head Mark Jacobs sheds a little light on the circumstances surrounding his departure from the EA-owned MMO developer in a farewell post on his personal blog.
Jacobs'"All Things Must Come To An End" post mainly looks back on his time with Mythic, from the early days of Dark Age of Camelot's pre-release through to his final days as GM of EA Mythic. He does briefly touch on his departure at the very beginning, however, explaining why he had suddenly gone on sabbatical, as mentioned in a previous post on the formation of EA's new joint BioWare/Mythic RPG/MMO group.
Early in May, Electronic Arts let me know that they wanted to make some changes within the Games Label and as a result of those changes I have been out of the office (and out of touch with the team, game, etc.) since that day.
Whether this means that EA asked him to step down or the proposed changes weren't to his liking and he simply took off is anyone's guess. Mark Jacobs certainly isn't telling.
...if you are looking or expecting me to damn EA or anyone there, you will be sorely disappointed. Over my 23 years of making games professionally I have refrained from attacking the competition, former and/or current partners, other game developers, etc. except on a few very rare instances. I have no intention of breaking with tradition at the present time and I hope my track record in this regard remains unchanged for the rest of my career.
All Things Must Come to an End [Online Games Are A Niche Market via MMORPG.com]