So far I think “Uptown Funk”, “Blinding Lights”, and “Old Town Road”. That doesn’t mean I love those songs. It means I think they answer the question. I know you may love “Irony x3” by Zigbones. But they ain’t it.
Edit: I’m sorry for the poorly worded question. I think it’s autism related, but I don’t see possibilities or alternative understandings easily, and when I wrote “decade” I thought 10 years and that was it.
Of course anyone answering from the perspective of 2010-2020 was making a perfectly reasonable and rational answer and I was very dismissive. I’m really sorry for that.
I remember an article that used (Spotify?) play trends to project this, and at the time they thought Pompeii by Bastille would be the one with longevity, while a few other hit songs by big names would be forgotten. I can’t find it now.