recursive entity reference cloning

Wondering if anyone has thought yet about doing a recursive clone?

to be more clear:

node type A has entity ref field for node type B which in turn has entity ref field for node type C

so example of cloning a node of type A:

original:
a1
- b1
-- c1
-- c2
- b2
-- c2
-- c3

cloning a1 creates:
a2
- b3
-- c4
-- c5
-b4
-- c5
-- c6

seems simple enough :)