The AN-94 is a strange weapon. It's being issued to Russian Special Forces. But that's about it. Currently, the Ak-107 is the main issue arm. Yes, there are many Ak-74s still in stock. This is due to the fact that the Russians live by a simple idea. IF IT ANI'T BROKE, DON'T FIX IT.
The AK-74, AK-107, and AN-94 all use the same cartridge and same magazine. So, it's going to be a long time before they just have one weapon system in stock.
The AN-94 is not going to stay around for a long time. First, the ergonomics of the AN-94 is not the best one. The shape of the pistol grip, and the inclined from the vertical plane magazine are way from being comfortable. The rear diopter sight has small apertures, not protected from dirt, and is hard to clean in the battle conditions. It also has sharp edges and can snag in the clothes or make a scratches on the skin when handled roughly. The grenade launcher mount under the barrel is a little weird, since it uses a large "bridge" between the stock and the launcher. The folding butt interferes with the trigger when folded, and the fire selector, which is separated from the safety, and it is hard to operate, especially when wet.