Funny, out of the 45 players on the server right now, 37 of them have a ranged weapon on them.  Bow, x-bow or thrown weapons.
Must be an NA problem then. over 80 % ranged? I dont think so. At least on EU there is 20 - 30 % cav on some maps. 
My estimation would be about max 30 % - 35 % dedicated ranged. Not counting the shielders who have an xbow with low wpf shooting once and than go into meele. 
Everything which is not dedicated range is not really a thread. putting random bolts aside.
I dont see the problem. I with my polearm alt seldom get shot. Sure you have to go for cover and stuff. but random headshots which happen from time to time are not really a threat as they are rare. 
 maybe at the end of round when there are a couple of archers left it gets more intens. 
But who are these archers shooting at? I would say mostly other archers (because they stand still every shot), cav coming near them and low armored. At least thats what I do with my archer, again only in the early and mid time of the round, not at the end.