What if Blizzard made a War Mode style toggle for mains and alts? This toggle would be unlocked once the designated main character on the account completes certain tasks with that character in a given season. Once those are done, they will have access to the alt realm on their alts.

In alt realms:
- AP required per level is lower
- Essence restrictions loosened
- Legendary items quicker to obtain
- Other requirements loosened as required

Mains however are not allowed to join the alt realm mid season. They can choose to rollover that character to an alt for the next season, but they must assign a new main for the next season. Only 1 alt is allowed to become a main in each season. What does everybody think?