ten dollars for a expansion is relatively cheap for mmos. i can get more entertainment value from it than the same price for a 3 hour movie that is now out so for me it is worth it.
we can debate forever as to why, what or whom is responsible for the games lack of subscribers. it has been done several times already so lets leave that dead horse alone for now.
my only issue will be the probable lack of new end game content once the level cap is increased recreating the past problems of such all over again. i seriously doubt anything between then and now anything will be added to mitigate this.
SWTOR doesn't seem like its meant to revolve around level 50. Its about playing through the stories of multiple classes. Feels like that is how its going to be for a while.