1. Saying you run the content before or don't want to repeat it doesn't change whether this is a good idea or not. That's literally every current savage tier/primal tier and ultimate content for every expansion. The devs already do this.
2. The idea lets you have access to all end game content scaled up simultaneously so you don't need to run the same EXACT content every month with every patch/expansion adding more. Also for new players it would be ALOT of content to go through.
3. Saying its a waste of resources is insulting to anyone who wants the idea, the people who want the idea wouldn't consider it a waste of resources. Its a dumb argument.
4.Consider new players and people who haven't cleared before, with the massive influx of new players it makes zero sense to be against expanding unreal content to make to so there is more party finders. People need different reasons to raid not just 1 or 2, its much harder to find parties for older content so many players who want to run old content get demoralized by the lack of people running it. Imagine not being rewarded for roulettes because veterans players are sick of doing them.
5. If you only do one raid every few months this idea was never for you to begin with, end game raiders run raids every week.
6. You ALL should do more to foster the community and help new players do end game raiding instead of just worrying about yourselves. Complaining about repeating content is a self centered argument that shouldn't even be given a second thought by the dev team. If they had no reasons to repeat content then there wouldn't be enough player economy to do half the content in the game to beat it. Once again look at tome stones/roulettes.
7. No one will put the gun to your head and force you to play this content, it's all optional. If you have some good friends then no matter content you run you will have fun doing it. Some of these arguments makes it seem you miss the point of playing an online game the content itself isn't the only reason you play.