As news raids are introduced into the game it will put an even larger strain on time for most players. Give guilds the option to "retire" a raid that's been cleared X amount of times.
A retired raid will then autojoin all members and give rewards out based on the randomized orders assigned.
Only certain raids will have the retire option based on CGs choice. Once a raid is retired it can then be "upgraded" to a new raid released. The new raid would offer the same rewards as the old raids final tier as its lowest tier with better rewards at higher levels. The raid launch cost of a tier 1 would also match the current final tier.
This idea could be built upon but while I would love new raids the current raids are already extremely time consuming.