Pandemic designer dev. Jens Andersen answers here:
No the games have not ended
I just have other responsibilities I am working on. Like considering potential downloadable content and what we'll need to release the tools for the mod community. Not to mention I get A LOT of feedback so I have to balance my time.
Your admins have set up a great forum for me where they are compiling a lot of your feedback, so I will be checking in there a good deal to better expidite my time. I'm still here, don't worry