This. The amount of people in this thread who are crying out to nerf normal modes is pretty disgusting if I'm honest.
I think people do forget the type of player base raids were aimed at originally, just look back at the Burning Crusade. Despite this, in modern times Blizzard and other sources have provided tools to make raiding accessible to a wider range of players of different skill levels and commitments. See LFR, cross-realm, Openraid, etc. People also need to remember just how long Throne of Thunder has been out, and need to bear in mind just how long it is going to remain the current tier of raiding before the next one.
The core aspect of raiding is playing as a TEAM, as this is primarily a team-based game. Normal modes requires your raid to work AS A TEAM to tackle the bosses with an understanding of the tactics required to beat it, and nerfing current normal modes only trivialises this. If you want a toned-down version of this, then other tools are there for you to use, such as LFR (which you can queue as a group!), and previous raid tiers. On top of this, normal modes will only become easier and easier in time with more gear, item upgrades, and a nerf in 5.4. If you cannot tackle even the earlier bosses in Throne of Thunder despite these nerfs, then it is clear that normal mode raiding isn't for your raid team with it's current set-up and approach.
Blizzard have pretty much nailed the difficulty of the current tier of raiding on normal mode with the boss tuning, and this is coming from someone who hasn't even begun to work on heroic modes. My casual raiding guild has had a brilliant time taking down these bosses with steady progression, resulting in a number of very satisfying kills. Especially in comparison to Dragon Soul, where the normal modes were pathetically easy.
Honestly, Throne of Thunder is one of the best raiding tiers Blizzard has brought out in a while, and it disheartens me to read so many comments that wishes to casualise this to the point where you don't even have to work as a team anymore, even when other options already exist.
Who needs teamwork in a team-based game, eh?