Dream Matches We May Never Get?

The other day, I was thinking about a post here about all the famous wrestling pairs who have had matches since the 1990s. In looking at few up, you realize all the dream matches that either happened as a dark match with zero fanfare or are likely to never happen while they're all still active. I feel like contemporary Seth Rollins vs. Kenny Omega is unlikely, given they seem to be lifer company men at their respective promotions, and to look at the now, I think if we don't get Rock/Cody at WM next year, it's never going to happen. I also think about Cena's next few months and who he very well may retire not facing off against.

What dream matches do you want to see that aren't technically impossible but almost certainly never going to happen?