It would be like Reckoning. Everyone will complain about the RNG and bad rolls. Then, once new stuff comes out it will die because it’s not worth the time and hassle for bad rewards compared to the new activities and loot.
I personally think that Menagerie will never die, less people playing it? Sure but it’ll never be pointless. Everytime the level cap gets raised Menagerie will always be one of the best places to level up, nothing comes close to three powerful drops of your choice
um it will be a plus one, so it really won't be worth it, just like literally every bounty and activity that wasn't a daily or weekly milestone this last season reset was a waste of time. Unless they secretly change how everything works again by just vaguely saying they are changing things. That said regular menagerie feels like less of a waste of time than reckoning, so we'll see how painful that chore feels then.
Even if it’s a +1 it’ll still be worth it, Raising up your lowest piece is a huge deal wether you think so or not. There were multiple times this season where some of my armor was 5-8 levels under my overall level and targeting your lowest pieces helps a lot.