Have there been many changes since January? Is Asura still attractive? According to the 'database' activity figures, it appears to still be quite active.
Ambuscade was the biggest change/addition since January with new gear sets almost every month and Asura's still the server with the largest English speaking population, if that's your idea of attractive.
The problem is Asura is becoming over active. I really wish other players deciding to move would start going to the 2nd most populated server. We could have 2-3 nicely filled servers in the end if everyone didn't just jump on the Asura train.
I wouldn't worry about that, it has fewer players on it today than it did at the start of the year, same as most (all?) other servers. It seems to be FFXI's Florida, where everyone goes to retire.