I doubt they have the same size dev team atm. Also the dev team is probably split up with a large group working on Heavensward, a smaller group working on content patches and maybe even a small group working on the next expansion allready.
Also the game is becoming more popular but it's not making that much money atm. Last info I read is that they have around 750k subs accross FF14 and the dragon quest one with probably largest part being FF14 subscriber