I don't buy the news that the LUNA has been attacked. I think it is an inside job since the developer issued an order of increasing the old LUNA supply with the idea of getting funds out of the inflated daily creation of the old LUNA tokens. LUNA collapsed because of the incompetence of the dev by making a wrong step toward solving the issue.
In due time, the top coins will be replaced one by one. Remember Litecoin being replaced by ETH? Way back Litecoin had been considered silver and Bitcoin being the gold.