This is true, there are plenty of different ways they could spin a solution. But LFD answers 90% of peoples problems and is already a trialled and tested solution to solving those specific problems.
I think it would be better to default to using LFD and then find ways to improve the social dynamics for players. For instance, going back to the proposal I listed
This provides population support for players as content is no longer frequently run, while maintaining the social dynamics for those at the fore-front of current content.
Other things they could add are Loot/rep/exp bonuses for non-LFD groups AND/OR guild groups. Crafting resources or consumes are also nice incentives for raiders who don’t need anything to help others with dungeon group content (especially since most raiders are double crafting professions and have no way of generating resources outside of alts).
As a side note, I think blizzard could have avoided a LOT of heat in this topic if they simply had come out and said “Hey, we think this is a problem and we would like to address it. What does the community think” instead of “We are doing this… no detailed explanation or reasoning”. Of course, as people have pointed out, the community often doesn’t know what is good for it. But at least they can say and see that their voice was actively involved in the decision making behind changes.