Speculation has been rampant on just how well Rift: Planes of Telara will sell on release. What even has me more excited is the prospect of a new MMO with a sub class that elevates above most newly released MMO's.
For the last few years, MMO releases went hand in hand with praise (Age of Conan and Warhammer Online), followed by a swift decline of populations due to a buggy and messy affair once players progressed in these fantasy worlds.
Rift has something going for it already, that most do not. An almost flawless delivery of a beta; word of mouth salesmanship; a chance to offer familiar gameplay in a polished and stable environment.
Barring any major nerfage at launch, Rift could contend with the masters of the genre (Lord of The Rings, EvE Online and Aion based on sales and representative data showing higher populations than most MMO's).
This led me to a question of the day after reading several blog posts all stating "Rift will be my MMO along with...(you fill in the blank)"
How often does an MMO player really play two MMO's on a regular basis?
For myself, it always fails. I even tried two years ago. I was subbing to Everquest 2 when I got a "free offer" to return to Age of Conan. AoC had made strides and was playing quite well. I continued my level grind and playtime through EQ2, but felt swayed to log into AoC more each day. Eventaully I felt it just was not worth it to keep both.
Putting this question out to Twitter brought in some interesting responses, and some corroborating data of why the player could or could not continue more than one MMO.