Oooh epeen thread!? Might I point out that if you look just a little bit down from this text you will see 5 beautiful and very shiny starz. Therefore I must have the most skill!
In terms of the original post, I agree with those who say server mergers are very unlikely. Although they don't really release subscriber data, I see no reason to believe that Firefoot's population has changed drastically over the past while, it's always been a low pop server and unless it really and truly dies I don't see server mergers on the horizon.
As for people who want said merger, my advice would be roll a toon on a high pop server. I like low population servers, although they can become insular and trolly, at least the trolls are lovable, and you know them. One of the reasons I originally picked firefoot was that I had heard it had a lower population, and despite all its flaws I don't think I'd want to play anywhere else.