They needed campaign DLC expansions, not all the other stuff they are putting out. The campaign overall needed to be about twice as long at least. There needed to be more to do in safe areas as well.
It isn't bad, but when you play through the same five hours of gameplay over and over and over, it does get stale.
I have no idea how much money it made, but if it did enough to warrant a sequel I honestly think they hurt themselves with the way they released it.
"Alien FTE 2? Wasn't that the unfinished game they released a couple of years ago? Think I'll pass."
Likewise with expansion dlcs released now. I doubt they will but if they did it has been too long to warrant much interest.