I think it's a good argument.
Unfortunately that doesn't make it a good argument.
It relies on a wholly unrealistic understanding of what evolution is. Evolution doesn't require an entire species to change into another species.
Think of it like this.
If you had a brother and your brother looks almost exactly like your father, much more like him than you. If your father then died, would you be surprised that your brother was still around?
Maybe sometimes you might get a shock seeing him come into the room, because he looks so much like your father; that would be you making the same sort of mistake thinking that the superficial resemblance means that they are the same thing.
The modern fish and chimps that we see are not the same species as the ancestral populations from which both we and they derived anymore than we are, although they may resemble them more closely physically.
The idea that they have stopped evolving is one with no basis in fact, they have not stopped evolving. If you expect to see fish giving birth to frogs then you have a very faulty understanding of what evolution is.
TTFN,
WK
Edited by Wounded King, : No reason given.