Didn't you say any topic title with a question mark means NO?
Reading thread now.
That's a fair conclusion here
There are some potential future issues but it is hardly REKT, for now at least.
In terms of quantum-resistance we have bigger problems to worry about (and so does Zcash)
This is a non-issue as the PoW can be forked easily. If the current NIST recommended encryption curves and algorithms are broken with quantum computing... well, yes, we have bigger issues as smooth points out.