First of all I want I start out by saying that I feel like Black ops 4 zombies has incorporated some features from WW2 zombies which is not good IMO. The two main ones I am talking about are the fact that BO4 has an armor system(no jugg) and that you no longer lose all your perks upon being downed which is like ww2( this change I think will benefit players, but I still prefer the old system). Now on to the no jugg, a lot of you might think that there is an armor system or that custom mutations will solve the problem but that just won't do. The armor system from what I've seen is horrible and is worse than ww2 and you don't earn xp when you use custom mutations. This means you won't be able to use a better custom loadout if you use custom mutations as your "subsitute juggernog". The other problem is that if you play online you won't have custom mutations even if you wanted to use it so there would be no way to have that extra health. The new perks are either too expensive or are just not worth buying so they are no means better than the original juggernog.
Lastly, the most important thing is that without juggernog there will no be way to accomplish high rounds. There was a reason why there was a challenge called the "no jug challenge" because it was a challenge to get round 100. Without juggernog, I think that there will be less active players this year than in previous years.