I also think its not too late to buy them, maybe they will go down in value more after the blessing of the Gods event ends and the new players will get less too. I like to buy shinys now also because for example shadows cost often less than 5xmeteorite cards, but would have a higher value because you need 5xmeteorite + $GODS + Flux. (the differenz is also because people just want to have the card in the deck and will just buy the cheapest).
In short, buying them now is a little bit specutativ, but to have some isnt a bad idea in my opinion.