^The point is not that Fossil decks are bad, it's just the fact that it's one deck. GG/Plox certainly won't waste space on it, Emp decks might possibly run it, but space is looking to be tight, Skittles can't run it, Eevee variants can't run it, Mag can't run it...the list goes on. And it isn't an issue unless there are 2 on the table early game, and what's one of the only decks that can get them out that early? Oh yeah, Fossils. Or some other undiscovered rogue that we haven't seen yet, which means very few people will be playing it.
Omastar/Wager is the bigger threat. GG/Plox has been looking for this kind of tech, and Emp and Fossils will take full advantage of it.