I really think LFR needs to stay but it needs to be made more difficult. Not that I see it happening but I'm not against some people being able to see the story/content on some level. It is already designed where raiders don't really have to step in LFR anymore and that is fine. (Well besides that attempt at making us go there early on for valor).
Mythic raiding IS cross-realm, I think it took a bit too long to be enabled as such but has been this way for a few months at least now for the current raid. No argument here though, forced 20 man mythic when some servers had low pops was way too brutal.