Johnny, my point was that the cockroach has had very little evolutionary pressure to change (much). Hence, it has not.
The cockroach example was to answer creationist who think that because a species is in the fossil record for a long time (like cockroaches --- been around pre-dinosaurs), that their continued existence somehow conflicts with evolution.
That idea is wrong --- evolution does not happen unless there is some kind of pressure that reinforces some trait (such as a cave environment).
And, of course, the cave is but the first step in a marathon.
But, to answer your point regarding a fundamental change into "something else."
Would gross changes say from a lean, mean, meat eater to a big, lumbering, vegitarian, work for you?
If so, the dinosaur at issue in this article is a mid-point between two such species.
Indeed, these weird dinos are yet more proof of one species changing into something completely different.