They already have the normal/heroic system of raids with the Normal coil and Savage coil. It is just that since the idea for making savage coil came up mid patch they didn't have better drops. Yoshi P already said if the format is popular they will in the future have specific savage mode items that drop. I am guessing in 2.4 there will be a normal coil and a savage mode right at the start with savage having slightly higher item levels then normal coil but being way harder, with possible recolor or the ability to dye the gear for savage drops.
Games like wow were made vastly easier by having user created addons like boss mods that make stuff louder and alert you to most every mechanic of and had timers for all boss abilities and when they will go off on fights since wow is very scripted much like arr. Tell you when an attack is coming out, warns you about having to move, dispel a debuff. For example if SE actually got around to releasing their addon API I am sure someone would make a similar boss mod. Your average player who isn't skilled enough to watch Twinitania's cast bar for Twister and also have her focus targeted when killing dread knights and always dies to Twister would do much better if there was so boss mod addon was making some obnoxious loud noise and yelling at you to RUN AWAY FROM TWISTER in huge letters they would be able to do that part.
I also remember when Blizzard invited the 2 best guilids to race eachother at blizzcon in a raid with no addons and they couldn't beat the last boss because they were so use to having to rely on addons to tell them about incoming attacks.