My two cents:
I think rotating around is healthy.  I can say with conviction that moving around keeps the game fresh for me.  I almost left the game this year, and figured why not, switch to bishop and see what that's like before I totally throw in the towel.  And the move made a difference.  I won't be quitting any time soon.  I can't guarantee I'll stay bishop for eternity, but I won't be quitting.
  
With that said, I'm not sure if switching every few days is for me, but I can see it being fun to follow the fight and say hi to everyone on a regular basis.  I've been on all 3 countries, and all 3 countries are chock full of good joes.  Each country does have its own personality, though.