It could just be a blip, but at the moment Ronnie's long game is sometimes suspect and he's lost a little fluency. Perhaps that's just for this UK Championships... perhaps he couldn't prepare as thoroughly as usual for the event, but his game felt roughly similar at the World Championships, so it's been like this for two Majors on the trot...
I'm not going to assume Ronnie will win another WC but do believe he has more titles in him, including a few rankers, which may or may not include more Triple Crown event wins.
Perhaps it would be surprising if this was his last Triple Crown event victory, but the glory can end at any time. He's probably more likely to extend his current TC tally of 15 though, than to see it end there.
I've followed Ronnie O'Sullivan my whole life... even as a kid watching him come onto the scene in the 90's. Every victory is sweet in the context of his whole career, and remembering especially his win at the German Masters in 2012 is particularly poignant for me, after believing myself that Ronnie might be more or less done on the very biggest stages, firmly thinking he had underachieved.
The match against Higginson, the finals win over Maguire were critical. Ronnie's reaction after that match said it all. In hindsight perhaps it's the most important tournament in his career, or the one that had the biggest knock on effect afterwards.
https://www.youtube.com/watch?v=R7PwotY-_uwIt's actually my favourite moment of Ronnie's career so far. I kid you not -- it isn't any of the World Championships or the UK Titles or the Masters; it's the 2012 German Masters.
Glory can end at any time. Ronnie looks good for a while yet, but take nothing for granted.