As a Brock fan and vocal supporter of his on these forums, the answer is no. While he accomplished a lot, his career in the UFC was very short lived and he never really cemented a legacy or anything of that nature. Sure, he didn't have the easiest of fights and was battling a BRUTAL illness, but that doesn't change the facts.
He had a great, but short, career in the UFC and his records stands as an accomplishment. But he is not HoF worthy.