However, from that argument, it's a hop, skip, and a jump to arguing that Robert Ludlum violated copyright because Jason Bourne is basically James Bond with a different accent and a head injury. Asserting that mere similarity is enough to create an infringement is a very slippery slope.
We're talking about two different things here I think. I can't take the Enterprise, shave the name and NCC-1701 off of it and lower the nacelles and claim it is a design of my own.
That's taking things that are obviously identifiable as Star Trek.
Is Captain Travis worth anything if he isn't attached to CBS' IP?