I would have to agree with Preach. It would help to add in a sense of "mystery" to PvE raiding that is pretty much non-existent now. I've raided since Vanilla and I enjoyed the sense of progress I got as my raid team moved onto new content. I think that same air of mystery encouraged people to look into raiding (it's partially what encouraged me to) and it'll be a good way to hook in newer players to "normal" raid. LFR will serve primarily as a way for everyone to experience the content and not as the "loot piñata" that it's frequently referred to as now.
Delayed LFR may not fix the issues of poor raiding, but hopefully it'll spark a bigger interest in raiding. Flex raiding and easier normal raids will be tasked to do the rest and become a good tool to teach people how to raid.