I never understood some people don't want others to get access to the content they have in the first place:
In other Games, like starcraft I never heared pros saying something along the liens of "The maps we play our tournaments on should not be available for play on non-pros Versions of starcraft" or I'm seeing regular Dota1&2 Games, tournament coverages, and read player interviews but no one ever said something like "That Hero should only be available to pick by pros, in casual games it shouldn't be pickable".
Even in WoW PvP, no one says "people with low rating should never see this one Arena or that Battleground". Only in WoW PvE related topics some people have the opinion that certain content should be harder to access.
OT: I definitely believe that there should be more (group) content for players to do outside of raiding, especially questing should be tweaked so that groups of people don't slow each other down.