Here is how it will fix anything.

Back at 70 on my hunter I needed the Sonic Spear from Murmur. So I got me a damn good group, everyone was in tier 4 and 5 and we were blowing through it. We get to Murmur and things just stop. Not a single idiot I was grouped with had any knowledge of Murmur and we werent able to defeat him... Player sin tier 4 and 5 shouldn't have any trouble with Murmur, it is one of the easiest fights. None of them had to go through the attunement which required you to kill Murmur.

Having attunements won't stop idiots from getting into end game raiding, it will just slow it down.