Not Paladins. Please.

Paladins' story basically ended in Diablo 2, with your generic "all of the paladins in the entire world are evil except for the one you're playing and his vague group" bullshit, while Crusaders have an actual story. Crusaders also have all of the Paladin abilities in addition to several much more interesting ones(flails are also great, as are the ridiculously huge shields).

There is no reason at all to step backwards into the role of Paladins again, while the Crusader story did not wrap up in D3, and has an actual narrative purpose. They're more interesting, and more powerful.

I know Diablo 4 is mostly shaping up to just stroke the dick of Diablo 2 nostalgia addicts, but seriously, Paladins were the most basic possible iteration of an already-boring trope, while Crusaders added a rarely-seen weapon type, several new abilities, and an entire branched out reason to exist, on top of literally every single thing that Paladins could already do(albeit in a much more boring way).

The only thing Crusaders lacked was the dumb-as-shit "Sacrifice"/Blood Ritual story flavor of them annointing their swords with their blood.

I feel similarly that Wizard should take priority over Sorceror, since that is another immediate step backwards in every meaningful way, but really not as severe as the Paladin thing.