In all seriousness, I don't mind reposts that people haven't seen recently or are largely forgotten. When mfs repost something everyone just saw I get peeved.
Here, at least I have an excuse: since not all communities are federated or subscribed to all the memes communities, I crossposted this meme once so that more people can see them.
There are good jokes in old posts, such as those bubbly iMessage screenshots from years ago. People posting their old meme stashes does liven this place up a bit for a little amount of effort.
Personally I try to make original memes based off of templates. (Like this one)
It will, because people will become tired of scrolling through meters of stuff they have already seen. It will start by people downvoting things they have seen multiple times, then they will try to block users doing it and if it doesn't help the complaining will start.