I've seen this point made a few times in the past, and made it myself once or twice, but it's a good one. Thompson's death proves that ''the black guy always dies first'' is slightly exaggerated.
I remember watching this with my sister on the very first airing. She predicted that the styrofoam lump who would be destroyed would be the black man, thus devaluing a black man, and reinforcing the sexist, patronizing "too pretty to die" attitude we saw on TV a lot. She was surprised at how it actually turned out...
Granted, there weren't that many people of color on the series to begin with, but can't recall any dying.
I'm glad a number of people agree with me that the two halves of this show don't really mesh.