They do tend to have that habit. It is likely that there will be a companion for the rest of the classes, or at least most of them.

Expect a Fallen Paladin, a Malarite Druid, a Sociopath Bard, a Silent Monk, a Cannibalistic Barbarian, and since they made both the elf companion and half elf companion edgy af, a Chaotic Good drow.

I really hope not though, lol :P