I always thought that memes were at least partially ephemeral. If the context behind it is strong enough, it can endure for years on end. Take the Trololo Guy as an example. There's a lot of these, though, that don't have this much luck. A few more are still fondly remembered, but mostly considered to be part of the old guard - the things you quote, but rarely ever use as an actual meme anymore. Stuff like "All your base", for instance. Slapping UBOA's face over everything is no longer trendy and hasn't been seen in a solid decade, in comparison, and the Slender Man Mythos is starting to show its age, with only the core content creators still insisting on keeping their ARGs going.
As for the Godwin Point, I don't think it's a meme so much as it's a Social Studies metric that's been thrown out of whack by the Internet. Plenty of people still end up comparing something or other to Nazi Germany, but I haven't seen a lot of comments mentioning the Godwin Point in recent years. At best, I'd say it's merged with the "You never go full retard" meme, the use of WWII sentiment or general pandering being comparable to a lack of worthwhile arguments for some - or a case of mental retardation.