Full Idea
The objection to nominalism is its consequence that if there were no human race (or other living things), nothing would be like anything else.
Gist of Idea
Nominalism has the problem that without humans nothing would resemble anything else
Source
Keith Campbell (The Metaphysic of Abstract Particulars [1981], §6)
Book Reference
'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.133
A Reaction
Anti-realists will be unflustered by this difficulty. Personally it strikes me as obvious that some aspects of resemblance are part of reality which we did not contribute. This I take to be a contingent fact, founded on the existence of natural kinds.