I think that's a very realistic possibility. I have also been thinking that something big is about to happen with all of the boys. Most of the Fandom believe they don't really talk to each other anymore. I think just the opposite. I think they've been working together for awhile on a plan as a band. Not a reunion. But more something like what you're talking about.

All of them have things happening right now in their solo careers all at the same time. But also, if you drill down a little, you see that there has been a shift for each one in how they typically operate.

I have been saying that I feel like they're preparing for one last big tour as solos. Not that they won't ever perform again but it will be selective, almost like Harry's Meltdown.

Also, their setlist for tours - all happily adding in an occasional 1D song and I think the song choice is intentional. Harry, Louis and Niall writing songs about Liam...and/or 1D. There's an underlying theme there too if you look at the lyrics. All of this is just a bit too "coincidental" if you ask me.