I would be more worried if gatehub crashed, Poloniex and Kraken are secure and will be up in no time, if prices go down for Xrp and other crypto, it's time to buy, due to the panic sell.
Eventually prices will go steadly up again after the cooldown on the DDos panic.

It's just a DDos... At least is not as bad as mtgox or Cryptsy.

so it could be worse.