CarChris: Max Payne - had a 3rd one that bombed
No One Lives Forever - was never that successful, 2nd one even less, and now licencing
Alone in the Dark - had a sequel that bombed (available on GoG)
Earth 2140-2160 - 2160 was a flop, RTS didn't sold that well anymore
Two Worlds
Sacred - you know, there is a sacred 3 out there and Sacred 2 - not sure if it made profit at all.
Soldier of Fortune - 3rd one was a very bad game and didn't sold well
Thief - last reanimation bombed
Neverwinter Nights - not sure, but afaik 2nd one wasn't that successfull. And Dragon Age and Mass Effect happend...
Dungeon Siege - 2nd one wasn't that successful, 3rd one even less
Styx
Gothic(s) - publisher got the rights and made ArcaniA (a Gothic tale) aka Gothic 4 (not that successful). 1 will be remade though.
Risen(s) - The devs went for Elex. Btw, those are the same guys who made Gothic. They can only make one game every few years. It is a very small Dev team.
Project I.G.I.
The Longest Journey (or Dreamfall) - 2nd one didn't sold that well afaik
Dracula (adventures)
Half-Life (of course!) - Steam made more money and GabeN had fun playing with other tech he was now able to throw money at.
Gabriel Knight
Serious Sam - you know there is 4 on here that isn't very old? Expecting one every 2 years or what?
Painkiller - if you redo the same game over and over again with the same engine one day sales go down...
Warcraft (single player) - Wold of Warcraft happend
BloodRayne
Crysis - EA might still got the rights, beside that Crytek went F2P and started to make money again, while Crysis 3 not so much
Torchlight - Heads left, studio shifted to Hob, Hob was not a hit, studio closed. And now rights are in China (perfect world)
F.E.A.R. - 2nd one wasn't that successful anymore, 3rd even less...
Prototype
Dirt (Colin McRae rally games) - well, he died. but actually, Dirt 5 is from 2020 - i wouldn't call that one dead yet (the game series). Well, EA bought them...
Dishonored - never was that successful in the first place (like everything from Arkane) but it is a single studio that made Prey, Wolfenstein and Deathoop. Maybe they return.
Secret Files
Broken Sword
Lost Horizon
And I surely forget others.
Whereas series continuing (with more or less often new games) are:
Tomb Raider
Hitman
Syberia
Age of Empires
Divinity games - to be honest, they did 3 very different types of games and named them all Divinity. IO modernizes the same game over and over again and named it Hitman. Phirania Bytes does the same type of game again and again and names it Gothic, Risen and Elex... - I'm not sure if you took anything behind the name in consideration.
Far Cry
Deus Ex - it is deader then some of the ones you named as being dead...
SpellForce
S.T.A.L.K.E.R.
Assassins Creed
Doom
Elder Scrolls
Witcher - it is not like CR:PR got much other stuff they could bring up.
Call of Duty
Layers of Fear
Homeworld
Darksiders
Fallout
Grand Theft Auto
I have to say, your list sometimes read if you don't know who made the game and what those studios did after the games you named...