In article , Alan Gould
writes
Secondly, although in many cases closely related plants share similar
growth preferences this may not always be true, where, for example, they
have come to occupy different habitats, and secondly, similarity of
growth preference does not imply close relationship. So removal of plant
from a particular family would not mean that you had to alter its
position in crop rotations - unless, of course, generations of gardeners
had got it wrong!

Yes, these are good points which hopefully would be considered by those
undertaking the task of re-classification.

Any formal reclassification that takes place in the light of DNA
evidence will be on the basis of genealogy, so your hope would appear to
be forlorn. And with the current state of the art DNA sequencing can
only shed light on genealogy, so your hope is doubly so.
--
Stewart Robert Hinsley