I'd say they're steadly going up. There's nearly 800 people online. I think this is the most I've seen for ages. On the last major playtime event there were about 600 at the peak. So yes, Aeria are doing things right and it's bringing players back as well as bringing new ones in.
Keep inviting people and friends to see SF thrive once again. We all know the gameplay is the most unique best First Person Shooter made.