What if the next bitcoins hash is 63 zeros followed by 7 000...0007 unlikely but possible right, what next???
I think, you want to mean if out of 64 digit first 63 are found as 0 in a block hash. No problem. If the requirement was to find less than 20 zero, next requirement will be less than 21 zero. What is found does not matter to determine the next hash.