I remember that, at beginning of One Hundred Days, Roosevelt declared that, if situation got worse, he would have requested to the Congress to be able to govern for decrees. So, if Great Depression is more hurting, FDR could obtain a sort of Congressional authorization to rule with decrees and great executive powers. His New Deal will save US economy as OTL and this will make him widely popular. The Comgress has a very large pro-Roosevelt majority. In 1937 objections from Supreme Court are bypassed when the Court Packing Scheme is approved by Roosevelt. He finally died in 1945 after saving World during Second World War and is succeeded by Henry Wallace, who relented FDR's extraordinary powers, before losing Congressional majority in 1946 (alternative is to be impeached in 1947) and probably the Presidency in 1948.