I don't think they're aiming for a certain target group lol, and never do I think they have in the past either. They just make the music that makes them happy. And dude it's not THAAAAAAT different. SoAPF was also majority clean vocals, lets say it was 65/35 on soapf and now it's 80/20. There's several elements that reminds me on SOAPF. Sure it does sound a bit different but I doubt the newer fans after ASOP and/or SoAPF is going to dislike it lol. IF has grown bigger for each album and year, there's no chance they'll grow smaller unless they make a country album.
Country is not the worst thing they could do.
Also, for my part, as I said before, it's not about clean vocals, it's about, how should I say so yo do understand? SC vocals doesn't reach me (I don't know if you understand what I mean.)
As an example, first time I listened to A New Dawn, and the chorus, my heart was like beating faster. The same, believe it or not, with Ropes (I really really love that song). But it doesn't happen with the new songs.