I read this post as you linked it earlier I though and to be honest I do not think this represents anything. This does not account for PvP players and players that have not reached the max level. If you look at the numbers of guilds that actually TRIED to do normal mode the % numbers are way higher, meaning the numbers based on the total amount of characters existing are just not really cutting it. This does show people do not want to raid but they do not have to. There is, as I stated before a lot of other stuff to do. Even if we take out 50% of active players to be PvP players, we double the % that are given at the end and which you posted here.
In addition even the OP of the post is giving no real resource for this information. and if I am not mistaken he mixed up players with guilds but that might be me making the mistake right there.
BUT even if I take the numbers he gives in his post for granted, most people did not even try to do normal mode. A high percantage of guilds that tried to kill bosses also downed them and this does not include the players that went with random groups. So while the overall % of players trying bosses was very low in comparrisson to the amount of subscirbers to the game, the amount of guilds that actually killed the bosses they tried has not been that bad.
So if we consider that 50% of players do PvP (which I think more do) and most of the others did not even TRY to do normal modes, the numbers you are presenting here are completely irrelevant. In addition there are not only two factions of players (Raids vs PvP) but a lot of players enjoy doing other stuff not looking into either of those. These numbers you provided give very little information on how many players that actually WANTED to raid failed before the first boss.
So again IF there are players willing to do raiding (and yes raiding includes wiping, as PvP includes dying) they could always start with normal and at least get some bosses down. While there might be players that do not want this we have LFR for those and/or Heroic dungeons if they do not want to hang out with random people.
For every player that has absolutely no interesst in Dungeons/Raiding etc. OR PvP, there are a lot of other things to do such as: Auction House, Pet Battles, Questing (even though I accept this might be very little this addon I doubt there are a lot of people who have finished every quest in WoW), Farming (yes there are people enjoying this), Achievement hunting etc.
So while the Thread you posted is really interesting it gives close to 0 information on how many people that actually wanted to kill bosses, did not because they were not into wiping. The numbers you provide displays all the people with active acounts in comparison to the number of guilds killing bosses. It just is not a source that applies to this topic m8.