Hello again Slon

My popularity with the Senate just dropped to four! Is this because of the extermination? I was under the impression that they liked it when I kept my settlements in line. I haven't failed a single mission! Oh, and when does the game end (year?)? Do I have as long as I want to kill all the other factions?
The game is designed so that your popularity with the senate will eventually drop no matter what you do. This is so that the inevitable civil war happens.

If I remember right the game ends in 14BC but there is a way to get past that date.

Read some of the guides in the Guide section on gameplay and they may answer more of your questions.