As others have said, the current development cycle will have to run its course and can't be altered. They've likely planned a big chunk of 5.0's dev cycle already too, perhaps even more Eureka.
Then consider that people DO play Eureka, and some enjoy it. The majority might complain about it all day long, but as long as people are setting foot in the instances, SE will consider it to be working - devs usually just see the game from the back end, through numbers of participants. I daresay that when I log on tonight, there will be multiple full instances of Pyros.
So, Eureka can't be stopped right now. We can just hope that devs act on feedback and can tweak it as best they can to make it 'better'.