It makes absolutely no sense. I don't care how much Verde and co exposition at us, fixing the tri-ni-sette should not magically alter time so that bad things never happened. XD
What I figured was that this future was always a parallel universe, because TYL!Tsuna and the others obviously never traveled to the future to fight Byakuran themselves, you know? In their timeline, they grew up normally without any time traveling, chapter-wasting antics. So whatever universe TYE!Tsuna and the rest are going back to will grow into a brand new timeline, but it won't actually undo anything that's already happened in this one. ...Am I making sense here? Anyway. Either way, bringing back Yamapapa and the rest is still dumb, but since everyone's angst is apparently being undone now (I'm looking at you, Gokudera in chapter 282), whatever. XD Amano will just have to give them brand new things to angst about. I'M COUNTING ON YOU, AMANO.
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What I figured was that this future was always a parallel universe, because TYL!Tsuna and the others obviously never traveled to the future to fight Byakuran themselves, you know? In their timeline, they grew up normally without any time traveling, chapter-wasting antics. So whatever universe TYE!Tsuna and the rest are going back to will grow into a brand new timeline, but it won't actually undo anything that's already happened in this one. ...Am I making sense here? Anyway. Either way, bringing back Yamapapa and the rest is still dumb, but since everyone's angst is apparently being undone now (I'm looking at you, Gokudera in chapter 282), whatever. XD Amano will just have to give them brand new things to angst about. I'M COUNTING ON YOU, AMANO.