Like I said, in my opinion FH2 doesnt require that many players for one server. 200 is imho the maximum considering how heavy our maps tend to be. On Africa maps I can imagine 200 no problem, but I wouldnt throw 200 players on say Tunis or Brest just because I could...
I played my fair share of 128p FH2 and I really enjoyed it, but I also enjoy 64p FH2. So to me personally 64-200 players is the most ideal set, depending of the map.
For PR I could imagine as ridiculous as over 200 players since their maps are so large and some are rather empty, would most likely make it more appealing to players like myself who have never found PR exciting.
But like I said, this is just my opinion.