It depends on what you mean for alive, what I can tell you is that Agartha is crowdy at times and that its not that hard to find groups/raids for activities (all but maybe NY raid E10).
There are loads of French players, they are the most after English speaking ones for sure. I know as I play with many of them (and I am not French )
I would not say that Funcom abandoned the game but as far as content update the news are few if not none. The last new content added was the Tank Commander quest and fight at the beginning of April.
Hope that helps and see ya ingame !