MMOGames have listed 5 games that need to be revived, top of the list CoH with a very nice and to the point why article.
http://www.mmogames.com/gamearticles/listed-5-mmorpgs-absolutely-need-revived/
There is only two games I agree with and they are City of. and Star Wars Galaxies pre NGE. Tabula Rasa, sorry but this closure was due to the dev team not having a defined goal, this game at best was muddled. They should have never listened to those p-layers wanting to nerf powers and abilities or completely changing a power such as the net gun into a snare from a dot. Fromm what I have seen of the other two I personally have not played them but Matrix Online did not get the dedication from Sony as other did.