I'll add my two cents on this as I am a long time player who is leaving the game.
There is no real growth in the game anymore. I love the game and applaud the developers for having created it. They high point of the game as approximately two years ago or so. There were enough players on the US2 server who were active that it involved multiple strong studios. There were studio fights every week, competition in Temple Challenges and there was a real sense of a gaming community.
The developers then opened another US server and an INT server and any new players flocked to those servers in the hopes that they could be a high ranked player starting at the same time as everyone else. This killed growth on the US2 server completely. With no new players coming in, studios became stagnant, studio fights became almost non-existent, battles for trophies ended and there was no growth. Players retired and I lost rivalries and no new players came in to create new rivalries.
I've played for four years (anniversary in the game is tomorrow). That's a long time to play a game and with no real new goals, it's just time. Some say it's the "Pay To Win" mentality that killed the game but I don't blame the devs for trying to make money. I hope they made a ton of money. They created a fun game, they should be rewarded. They just expanded the servers too fast and too much. There is no new blood coming in and so the game withers on the vine.
I loved playing against you players on the US2 server. I wish you all the best!