Seems now TES will have something to offer most gamers. Single player series and an MMO. Some will stick with single player, some will play the MMO that never desired to play the single players and there will be plenty who enjoy playing both.
One does not distract or devalue the other in my opinion.
I hope you are right. In the past they only released a TES game every five years and I understood that one of the reasons that Bethesda did not release a TES title more frequently was that the company was focusing its energy on other projects. With the success of Skyrim, I was hoping we would see the release of Elder Scrolls VI within three years, instead of the typical five year wait. An MMO seems like a huge project and I am worried that it may distract from the creation of future single player games.
Also there was that rumor a few years back that there would be no Elder Scrolls V (or that it would be pushed back a few years) because they were going to focus on an MMO instead. http://www.joystiq.com/2009/08/15/elder-scrolls-v-not-in-the-works-theres-a-chance-for-elder-s/
So the announcement that they are doing an MMO makes me worry whether there will even be a TES VI and if so, how long it might be before we see it. Has there been any official announcement from Bethesda that they are still committed to producing more games in the single player series?