It would be interesting to know what SW himself thinks of PT right now, and the possibilities of them doing something again. Whenever he answers those questions in interviews, it just comes off as a very standard answer you would give to please both camps. You have the people loving his solo-stuff and wanting more of that, but he also leaves that "but maybe" that gives some hope for the people more interested in new PT.
From different interviews it seems quite clear that he wasn't happy with how The Incident came out, and for whatever reason, he has touched upon it in a few different interviews I've seen, and mainly spoken about how every other PT album seemed to be really good, and the others.. not so much. (Which kinda surprised me, because that means he wasn't as fond of Deadwing or LBS).
I really do hope that The Incident isn't some taint that has affected SW in a way that he wouldn't want to do another PT-album. Hopefully if he wasn't happy with the album, it could work as motivator instead. Is that really how he wants PT to end, the main musical project of his career, to end on an album that he wasn't happy with. I think in the end he will probably do whatever he wants, but it would be cool if that involved PT. I think he continues to show on his solo albums that the more melodic songs are in most cases the highlights (deform to form a star, the raven that refused to sing, postcard, like dust i have cleared from my eye), and the more melodic or "poppy" side of him really shined through more in PT. He does progressive rock well too, but I think it's the more melody-based and catchy songs that he really does the best.