I think they do.
This is obviously not March of Eagles or Sengoku where they abandoned it immediately when those titles didn't do all that well on release. I've been very surprised and impressed by the amount of work they have put in over the last couple years for a rather small playerbase.
Hopefully the 2.0 update turns this saga around, this is one of my favorite time periods and I really want this game to excel and be a commercial success.
I don't know that games you cited, but Imperator Rome for me can't be abandoned, you have the most awesome ancient historical period with Gauls,Rome, Greek, Persians, Carthage, Thracia, Germans, Iberians and many many others.
And you have Alexander the Great, Julius Caesar, Hannibal, Vercingetorix and many many others Great Generals. Abandoned this game is like saying that your own company is not capable of handle this. Which is totally different from be a success like Crusaders Kings, EU4 or HOI4.
The amount of content that their have to add to this game, the mechanics that they can put on that is huge.
And for me Imperator Rome is better than Stellaris and EU4, sometimes I think, why EU4 don't implement things that I:R has. But we know that are different projects and they were developed in different years.
But I have faith this will be a success as the other is.
Just remember this times were well focused on Political Wars and Battlefields. The wars on that time were hard and decisive.