Having heroics slightly below RF would be acceptable for me, along with new 5 mans each tier. I don't have any problems with LFR existing as long as there aren't any upgrades in it when compared to a previous tier's normal (heroic in WoD) mode gear. And as long as it's not the only PvE catch-up mechanic. It's got far too long queue and clear times to be a good catch-up mechanic. The Devs mentioned LFR being a quick 45-60 minute thing, which is a far stretch from reality and (heroic) dungeons served that role in Wrath and Cata just fine. LFR would be the option for when you have plenty of gametime available.