LFR just could share ID with Normal and HC. Problem solved. Nobody will every be forced to raid LFR again for loot when they have a normal or HC raid.
Then we apply the scaling from flex to LFR so that people can still do it even if there not as many guys playing LFR anymore.
Everybody sees content, everybody gets loot, nobody is forced to do multiple runs of the same instance per week because of the one item that never drops!