It will increase come expansion. This is a thing for MMO's, even WoW, where over a period of time when the initial game is released or it's expansion pack, the numbers boom and rise very high. Over time, it drops to lower numbers till the next expansion arrives. If I had to take an educated guess, I would say come expansion (if advertised well), you will see a ton of returning players and new ones, possibly hitting back into 800k to (a stretch here) a million subscribers. Over time in Heavensward, probably drop to about 600k-700k. Games like WoW did not get 10 million+ subscribers in a day. This was built up in a course of 5-6 years. ARR has been out for nearly 1.5 years now. The more interesting question is, what do you think numbers will be if SE keeps pushing hard 5 years from now?