Here's Mairead Carlin's Instagram post from October 16th:
https://www.instagram.com/p/BbjXxPKAh2q/Home safe and sound. Last tour with my better half(for now anyway..)
Couldn’t be prouder of everything that’s coming your way baby.
Your new single is poignant and beautiful and regardless of anything-
it has touched peoples hearts and that’s what’s important. Here’s to the futureThat post is loaded with interesting stuff!
Firstly, Home "Safe and Sound" is the name of Glenn & Ronan's new single. That's really clever on Mairead's part.
"Last tour with my better half ... Couldn’t be prouder of everything that’s coming your way" ...
... That kind of sounds like Glenn & Ronan will be focusing on their own work, including their upcoming album, and won't be on the Homecoming tour with Celtic Woman. I think that would make sense. If they want to want to try to have success as a duo, being on tour 8+ months a year with Celtic Woman is conducive to their other goals. For the most part, it would be difficult to generate attention outside of the Celtic Woman fanbase without doing their own shows, promos, etc. That said, they kind of kickstarted their careers doing a certain Adele medley last year, which took off when they were with Celtic Woman.
Speaking of the Adele medley, let us segue to this comment: "your new single is poignant and beautiful and regardless of anything - it has touched peoples hearts and that’s what’s important." One possible interpretation of that is that after the enormous and sudden success of their Adele medley, they had certain expectations and it's taking a little longer than expected to sustain the level of success and popularity they were hoping for. Them performing on their own would make sense if they want to commit to achieving their goals as a duo.
Either way, if you like their music, I'm sure they'd appreciate lots of support and encouragement.