He would still be a strong candidate - the Roosevelt name, a strong political record in New York, etc. However, absent the Depression, FDR would not have a ready-made issue to run on, and Hoover would probably be a much stronger candidate. Roosevelt would also be a different President, if elected. With no economic and social crisis, it is unlikely FDR would be as "progressive". Certainly the impetus behind the New Deal and the massive expansion of Federal power would never happen...or at least not happen when it did OTL.