With respect, are you sure about that Roland. The number of people playing A17 is surely to be expected because people have been waiting with baited breath for 18 months for A17 to drop. It stands to reason that there will be a huge number of people playing it to see how it measures up.
That doesnt equate to everyone playing because they love the game now. That simply means everyone is trying it out, and a lot that try it out wont be back. Give it a few months and if the changes that are made are not pleasing to the people, I dont believe there will be HUGE numbers playing it for long.
TFP may be happy with where the game is now, but maybe not when the impact of negative feedback hits them in the hip pocket.