Radical Suggestion. Put Endgame after Act 3 and scatter the rest of the Campaign in Endgame.

"

Kraythax#2592 wrote:

The campaign would continue but not immediately. It would be discovered while mapping. While mappying you discover a part of the weapon or meet a principal figure. You are mapping along, enter a new map and pow, its a piece of the campaign. It makes it less lineaar, less tiresome and better.

less linear, but you mentioned the new mapping would need to be more linear than it is now.... while some acts are non-linear i have a hard time figuring out what about this linearity bothers you that you want to arrive at some specific ratio of linearity. delve was incredibly repetitive to the point that it could be an endless ledge event and i doubt people would notice. unless you want to choose what rewards you get along the way? is this about loot?