I think it is. I mentioned this possiblity here:

I can also understand that many people would mind their descendants being modified in such a fashion, perhaps their dis-utility is enough to offset the utility of their modified descendants.

However I think the tipping point starts way before "not a single line of derived code":

However how true is this of distant descendants that only share passing resemblance? I think a helpful reminder of scale might be our own self domestication.