If the point you are making is that most people vote according to nationalities (and I am not saying you are wrong) then why do we have any polls hare at all except between players of the same nationality.
Why not just periodically conduct a "nationality census" and then tell everyone who the greatest batsmen, openers, Spinners, pacers etc in the world are. We could even rank them accurately to the nearest whole number
By the way, we had an Ambrose versus Lillee poll last year and Ambrose won 22:15. I did not know we have more Australians than West Indians here.