Solo player endgame progression

In the current model of level-based MMORPGs, the game is stupidly divided into two very different parts: A leveling part which is mostly played solo, and an endgame part where progression is limited to group content like raiding. There is an increasing gap between the two, and developers are starting to think how to close it. Now I'd think it would be better to make the leveling game more group friendly, but given the extreme attitude against "forced grouping" some players have, the alternative

World of Warkraft...