It seems to me that since the lvl cap increased from 20-25 we've lost something big in Epic Quests promoting grouping.
Back when cap was 20 you heard about people soloing Epic quests often enough on these forums but the default was the 6 man group rather than 2 man IP and maybe we'll get a full group before we complete that it has become.
A possible solution to this {and to the oft heard complaint that Soloing is too easy} would be for the Devs to reverse the Dungeon Scaling of Epic {Only Epic} Quests.
i.e.
In Epic Quests scaling is set to zero for 6 man groups and it goes 6,5,4,3 rather than 1,2,3,4
Hires of course would still count as half or whatever Gold Seals actually count as.