LFR Is for people who want to "experience" the content. You still have a chance to gear up.
Normal is for organized groups who want some sort of challenge and reward
Heroic is for those who want a substantial challenge and reward.
If you can't down a boss in ToT on normal with your group. Go back to the last Tier and steam roll it and get some more gear, go do some dailies and get gear, do LFR and get some gear etc. If you continue to wipe, assess who is failing in the group and either encourage them to actually learn how to play and do a modicum of research or replace them.
I am ok with nerfs if there is actually a need. After more and more reading on these, it just seems like it is pandering to the groups that have members that can't figure out how to not stand in fire or how to dispel or how to use defensive CDs.All of which are basic to any raiding group and it is a disservice to the group. Or to those groups that want to completely skip previous content and do the highest level raid. Then again, they are just going to get to Toros and Magaera and need more nerfs for those fights as well.