There definitely should be a lot of content for each individual group whether it be casual or hardcore. However I don't believe that content should be nerfed for those who don't have the time. MMORPGs are a time investment game. Content should be made for that specific group. If they decrease or increase time/difficulty of the content it's just going to irritate the opposite group.
Also I don't think that because you have an hour that should mean you get an instant tele to the dungeon or area the content you want is at. Use your Anima.
When it comes to party play there should be an easy quick system to be able to hop in and play with others to do a dungeon or a quest. I've never played WoW (and I don't plan to) so I can't speak for how that game works but FFXI had a great system for lfping.