I think you're failing to consider something in your evaluation here. While it's true that 2150 is a low number for a mainstream game that's only a month old, HoS is not a mainstream game. Despite the complaints of many RO1 veterans, this game is far from the arcade experience that your average CoD or BF player will be attracted to (i.e. not a fast enough pace, unforgiving of screw ups, the fact that you can be killed in one shot by any weapon as opposed to only sniper rifles (and the fact that there's only one or two sniper rifles per side)). . This is a niche title with a vastly smaller audience. That being the case, I don't personally think 2150 is a particularly low number of players. I will admit, however, that HoS is my first venture away from the arcade style shooters so my opinion may not be well enough informed on such matters. This fact does, in my opinion, give me some semblence of credibility in saying that this game isn't the arcade CoD clone so many people are accusing it of being (because I just came from those games).
This goes back to the above, in my opinion. How many of those 9000 were people looking for CoD/BF gameplay and found that the game wasn't for them? I think you're making quite the assumption that the game lost 7000 players due to it's issues. There's no denying that the launch had it's issues, but I think the vast majority of the decline in player numbers can be attributed to people wanting the game to be the arcade shooter that it clearly is not.
I do think it's far too early to proclaim that the game is dying simply because of the fact that the audience is as narrow as it is. I also believe that ironing out the remaining issues and mods beginning to crop up (once the full SDK is in people's hands) will bring back some of those players who have left for the time being.
A fair point, to be sure. It is, however, very easy to depart from reasoned criticism and ideas into the realm of vitriolic hyperbole. Unfortunately I see far more of the latter than the former around here.
Can't comment on this with any authority. From the extremely small amount of time I messed around with RO:Ost, I don't know that I think they "let go of the original gameplay concept" so much as expanded upon it. Not everyone will agree with the way they've done so, but I don't see it as an abandonment of the idea of RO1, personally.
Of course, you're more than free to dismiss my opinions as an RO noob