Cannot see him accepting anything below Pyramid headline, bar a secret slot. He's outright topped R+L for good now - that's as near a barometer as you arguably get for who's in the mix as a credible shout.
Except, of course, it isn't as cut-and-paste as I'd like to suggest, because I think the prospects of Hozier headlining Glastonbury any time soon feel... remote.
Young in that weird bracket where I think he appeals very much to the older Glastonbury goer - and by that, I mean the demographics of a decade-and-a-half ago, when he last played.
He doesn't seem to have broadly cut through to a younger generation, at least on British shores, in the way your McCartneys and your Johns have done so - likely in no small part because he isn't that homegrown superstar.