You must be blind.
First off: Barely scratched normal NH???? Are u looking at the right character? I have killed every boss in NM NH 2-3 times. That is more then scratched the surface its done, finished. Those fights are not going to change no matter how many more times I do them.
Second: I give no fuck's about heroic NH. I did Heroic EN while current and knocked out Heroic TOV about a week ago just so I could get my current mog. Heroic/Mythic raiding holds ZERO interest to me.
Finally: No LFR does not dimishes the amount of people who want to do higher difficulties and no I am not proof that it does. If LFR was removed tomorrow (and not replaced with a queable raid mode), I would 100% stop playing WoW and never return. You know what dimishes players from wanting to do NM+ raiding....Go look at LFG and its a perfect example why people avoid it.
To add if u even looked at my achievement's (Its clear u didn't) I cleared NM NH before LFR was even fully open.