Doing stuff like Goblins and Elves would be a massive waste. They're mostly monocolor tribes, they have tons and tons of Commander options in all kinds of colors, the decks themselves are usually gonna be pretty linear with well-worn strategies and lots of cards that already get reprinted all the time.
The best choices here would be tribes that actually benefit from having a deck printed: either popular tribes that have poor or no commanders, or existing types that can gain flexibility by printing some useful new members but which wouldn't frequently show up in new expansions, or tribes where the available commanders have bad color identities so people can't currently build the deck they'd want to.
While I agree with elves and the like not necessarily seeing a go this time around (especially elves, with the mono-green planeswalker elf commander deck a few years back - it has a decent amount of elf lords and other shenanigans) - out of curiosity, what are you thinking for 'tribal', then?
For example, Slivers would be an decent 're-print' choice, as they're relatively scarce to find, have only EDIT: 4 (Overlord, Queen, Hivelord, Legion) that I can think of) commander choices that actually match the tribal theme, decently powered as a 'precon', and able to be tinkered with to get potentially absurd if people want.
But at the same time, they're (relatively) well known in the history of EDH, and wouldn't be something necessarily 'new' to explore in an EDH setting.
But other than that, I'm struggling to think of other (potentially) multi-color tribes with a solid 'theme' that haven't already been explored - I.e. Vampires (either mono-black or Black/Red) aren't really looked at super in-depth in EDH, but already have both Olivias, Drana, Anown, etc...
Similarly, Angels could be cool, but are a feature of a lot of high-tier decks and have plenty of commander choices.
But if you boil it down to stuff like 'Hydras', yeah they're cool and all, but I don't really think 'tribe' from them.