It's nonsense that GT3 and a complete lineup of F1 tracks would bring AMS' playercount to the levels where AC and pCars are.
When you start a racing sim discussion in a general gaming forum you will hear about AC, pCars, Grid and maybe Dirt Rally. rF2, AMS, L4S, RBR.... you will barely see mentioned.
Reason? Graphics and marketing.
I think AMS has already reached a high enough level of graphical fidelity. Just gras and in-car textures need some more love and of course cockpit shadows are urgently required. Adding "cinematic" effects to the cockpit view might be cool for videos but would alienate the simracers who prefer authenticity.
Marketingwise i have seen much better from other games. It's of course a question of money, but in the end if you decide to stick with simracing rather than making a driving game you have to deal with the niche market playerbase.
In the end a big part is on us. Do you suggest AMS to everybody? Do you post about updates/news in your gaming forums/blogs/whatever? Do you upload good looking AMS videos? Do you stream your races? Do you join empty or low populated AMS servers to motivate others to join you and help AMS to grow a healthy MP scene?
We can do lots of marketing for Reiza and AMS.