I would agree to a certain extent with the raid armour but you do have to put a fair amount of time into wvw to be able to get all the tickets to purchase the the wvw leggo armour, I don't believe it is a small amount of time to invest in wvw to get the armours. Because it is not dependant on your participation in wvw it is just how much time you are willing to invest and tbh I don't think you are rewarded for your effort in wvw/pvp you are just forced to spend x amount of time in the game. Unlike with Raiding you are rewarded for your effort because if you can complete the raids in a fast efficent way you can do those and then you are able to do other things in the game to split up your time and try different things. So I think the WvW and PvP should pretty much be the same as the Raid and probably the new OW, and that is the effort you spend on trying to get it not the time you spend on trying to get it. And one way you could speed up the way to get the WvW armour, you perhaps use the emblems of the Conqueror and the Emblems of the Avenger to purchase skirmish claim tickets as you can only get them by actually participating in WvW, that might actually stop people actually afking their way to "victory" (getting the leggo armour), it probably would encourge people to actually participate. You might even have to limit the amout of those emblems you can turn in per week (depending on how many tickets you get per emblem)
This is a lil off the topic but I don't see why they can't just put the skins (for people that have gotten leggo armour) in achievements required to be done to get the skins for the other leggo's. I.E the raid armour, but you would have to still raid to get the achievements to open said armour skin. You would still have to wvw to get the achievments to get the wvw armour (though to be brutally honest the wvw/pvp armour is rubbish looking imo) and so on for the skins