Good answer!
But Yes i Think its a Good time to buy Alts
And Even those alts wich might be Not top altcoins but falling a most coz anything whats falling Will atracting investors coz investors Think that they buy with Low Price!
But there is rumours like a altcoins wounth survive...
I think you need to calm down for a while and see what will happen in the next hours. And if the altcoin still getting down, then you can prepare yourself to place your buy order at any price, but you need to analyze if the price will be getting down or not. The investors like to buy low price coins, especially if they can see the price is getting dump so hard because they can buy a huge amount.
But I don't think that the altcoin won't survive because we know that in the altcoin, many potential altcoins can survive and it will increase again at the right time. So if you want to buy any altcoin, you need to analyze first, make sure you have money to buy, make your buy order in many prices so you can get a lower rate of the altcoin.
The top altcoin will be fallen if bitcoin price is down, but we don't know how much it will down. But if you cannot be patient, then you can buy the altcoin at any price because it will go up soon.