Not at all. Going by the novel at least Sonny might have been a good Don during a war (the book compares him to Napoleon), but otherwise no chance in hell. He'd likely end up like Al Capone; Capone went around flaunting his power to anyone and everything he could, and it not only made him lose respect (the novel states the other Dons thought that Chicago were a bunch of goons and animals) but also escalated his downfall.