Personally I feel that the health isnt the problem, its simply the gear bs.
Ideally, faster classes get more gear, support should have more perks.
This way if you want your fireteam to have limitless health, you have to be easily killable as well.
This goes for pred too,
Berzerker will no longer have the most gear, on top of the most health. Berzerker will rely solely on perks. Scout will be able to shift focus to more trapping, and diversion tactics, which is really how it should be designed in the first place.
Middle grounds will stay the same
though its gonna be a bit awkward for the fireteam, as there are 4 classes not 3. but still.