Doug;Come out to Orange County, California some time. You'll find many young men willing to dispute the 'death' of Naziism with you quite violently. I've run afoul of them once or twice at concerts.
Are the Nazis as a governmental force gone? I'd say 'mostly' but not 'entirely'. The right wing party in Germany has spawned factions embracing the whole of Hitler's regime, and expanding it even farther. Around the world, other groups may not be 'nazi' in name, but in spirit they're as close as could be.
No, they're not gone. As much as could be wished, it's an infection that it doesn't seem can be cured.
M