One thing that came to mind, and it may not necessarily have to do with race... how many SAMOAN contestants were on TPIR in Bob's last years? (and I mean ACTUAL Samoans, not people that pick up or injure Bob in the manner of a Samoan)
I think it goes without saying that Bob must've told Stan "no more Samoan contestants" at some point. Personally, I enjoyed it whenever Bob would make a Samoan take an "oath" promising not to pick him up. Then again, I think, especially in the last 5 years Bob hosted TPIR, most contestants had the common sense to know that Bob was a 80+ year old guy and can't take a beating like he could in the 70s and 80s.
I'd like to see a Samoan in the Drew Carey era. I realize that Drew is larger than Bob, and it's funnier to see a woman 10 times Bob's size take on such a thin guy, but Samoans were part of what made TPIR so great.