Assuming you realize most people won't ever step up to Flex/Normal/Heroic, and rarely, if ever do guilded/organized activities.
There's several options I see:
1) The BC Model:
This was awful.
2) The late wrath model:
A highly puggable raid/part of a raid
This could work, but I don't think they could make enough dungeons to sustain people.
3) Tell people to deal with it.
I don't think this'll work either, as without something to do at the endgame, these people are likely to get bored even faster than they are already, and quit in even bigger droves.
I'm one to admit that LFR isn't ideal. Infact, it's far from ideal. But in terms of a game based almost entirely around raiding, I don't see what other options they have now that an influx of people replacing people quitting has stopped. They got to keep all those casuals occupied somehow, and it seems to halfway-halfway work.
Ideally, they need a shit load of dungeons, and a further delayed LFR, or something. But that'd never happen.
I just think, also, people just need to realize most people don't do, haven't done, and will likely never do organized activities in this, or any other MMO. It's the nature of the audience, or something. Why do MMOs attract these people? I don't know :x But they do, and they're the majority. So they have to be pleased somehow, right?