PC Graal was neglected for years which made it difficult attracting new players while old players moved on, the lack of support and dwindling playercount eventually made developers leave, which in turn led to further decreases in the playercount.
It doesn't help that they have to compete with the iServers that have a much larger playercount and are more easily accessible.
I think the pc servers could do well again, but at this point it'd need more than just fixing the client. It is mostly up to if the players decide to stick around or not.