xtrabytes is going to pull a digibyte, so why even ask what the next xtrabytes is when it's not even trading above Ark in market cap yet? Once it hits bittrex and once they get the genesis block for the new static blockchain going and start the transition to the new blockchain, watch it explode.
Next Xtrabytes in the sense of a coin trading in the double digit satos suddenly jumping up to 1k+