Not really an opinion. It's a certainty that if you make content more difficult than less players are likely to do it. If you continue this trend less and less players are likely to do it. If that weren't true then everyone would have heroic lei shen achievements in the first week. I don't understand what's an opinion about any of that when it's actually a trend and it's a trend the developers have coped to. Theirs no opinion involved. You may not think it's difficult but you can't argue that it has increased in complexity will leave players behind (newer and weaker players). As this continues to rise you'll have more and more players left behind. That isn't an opinion, it's just obvious.
The only risky thing is telling your players they aren't good enough for normal difficulty. That is currently what the game does. It's a bad move to tell the majority of people look you get stuck in lfr and not normal because well that's normal. You people really really view yourselves in such ridiculous lights. The "respect associated with being a heroic raider". Tip. Nobody gives a fuck. Loss of respect? I mean you can say that boat sailed already but really who gives a shit. This argument is so tired. I really don't mean to be dismissive but you honestly have a really bizarre world view if you think the majority of raiders (let alone players) actually gives a flying fuck about heroic raiders. If you actually think any large chunk of the player base pays 15 bucks a month to be in awe of heroic raiders. The argument from prestige is dead. NOBODY CARES or even respects your heroic raid. You people have some weird attachments to this game...2.) Lower the difficulty of normal and heroic raiding.
If you lower the difficulty of normal modes to reduce the gap between that and LFR then you might as well lower the difficulty of heroics too for the same reason. This would be a good band-aid initially but Blizzard would inevitably lose a lot of respect from the long running normal-mode community as well as losing a lot of the heroic guild community because there would no longer be a level of respect associated with being a heroic raider. I have no evidence to support this but I'd wager the majority of Blizzard's long-term subscriptions come from the normal and heroic raiders with the ultra casuals subscribing for short periods of time between content patches. Shunning the more skilled members of the WoW community could be a risky proposition from a business PoV.