On the contrary, Tsuna now over powers him probably 50-100 fold. He incinerated Byakuran's body with his unleashed X-burner; he's got the gear now, which probably amplifies this power more than we can anticipate. Byakuran is clearly portrayed as someone who has "seen the light." In the anime (I couldn't find it in the manga), Byakuran appears on a beach wearing something like a house-arrest anklet and smiling as if refreshingly revitalized. He's been given a second chance. Think of his healing Yamamoto as atonement for what he has done. The fact remains that he still can access his omniscient abilities because his ability to access parallel worlds has never ceased; however, the Mare rings have been sealed and the trinesette is ...done? lolI mean he could just come back and instead of dragging things out with petty games, just slaughter everyone with ease from the beginning, especially since he now knows where their base will be built.
Personally, I think this sets the stage to have him to become Tsuna's external advisor. Just food for thought