I think you both wrong cuz I’m not, Coldplay has been returning rock since last year, and Coldplay is changing back to roots because they’re old, and that’s why the Music of the Spheres will be between space rock like X&Y and Modern rock (hard rock) for the first time because they’re changing if you are understanding of what I say about my theory.
I don't know if I really agree with the whole "rock is dead" ethos so many artists carry now. Chris has said that he feels everything's already been tried in rock, which still I don't think is true.
Yes, rock is maybe "dead" in the sense it no longer charts on the Top 40, but as a rock listener there are still plenty of amazing, innovative bands out there right now. Also, importantly, you're seeing a resurgence of artists using old rock styles in pop music now. The 1975's new record is great and has some interesting rock-inspired tracks. Then there's Post Malone incorporating rock riffs and grooves into his music. I could go on...
What we're seeing now is artists become genre-less in the age of streaming. There will continue to be really good rock songs every year hit top 40, but they might be from non-rock bands or pop artists doing a one-off rock track. If there is ever a group that could pull of a rock song and make it sound classy and timeless, I think it is Coldplay. So I hope it's true.