Dies to Removal

At what point do you just drop the non goblins and play Goblins?

When I want the deck to be slower I guess.

Goblin lords are terrible, definitely not like the Merfolk ones.

Rabblemaster is just too slow (I've really tried).

Piledriver is cool but totally dies to everything and doesn't have any real evasion. I would consider him but I don't think there's anything I'd want to drop for him.

Honestly the tribal thing feels cute but ultimately unnecessary.