I think they could do alot with a story centered on Braska's pilgrimage. There's alot about it we don't know. How jecht got to Spira, how he ended up in Bevelle to meet Auron and braska to begin with, what he did during the time it took him to get there, and so on. There's alot about jecht that we never learned. That goes for Auron too, his past is mentioned alot, like he was an old friend of Maester Kinoc, though this friendship was never discussed in great detail, maybe Auron was a warrior monk or something. And we know almost nothing about Braska even during his pilgrimage, let alone before it.
Also as for the story being known iin advance, that's not nescessarily true. They might have looked into other options for killing Sin too. They may have visted places we never could in X because we were too busy to do any sightseeing because we were running away from the pissed off temple and pissed off guado and the pissed off Al Bhed, and the pissed off Dead Maesters... really, we were running from someone who wan't happy with us most of the time. Also, defeating Sin wasn't really the end of that chapter of the X story. Auron after the battle went back to confront Yunalesca before dying, God knows what else he did before that. And after. He survived death, and said he used Sin to get to Zanarkand, never really elaborated on how he did that. And between there he fought his way back down the mountain to send Kimarhi to look after Yuna, but after this made it all the way back to run into Rin. So he may have gone on to do alot after the 'final battle' (which by the way would be aweosme to play through, I would love to play through the epic battle between BFA and Sin) And even then, Tidus would've been a little kid when he got to the dream Zanarkand. Could even play through Jecht's transformation into the New Sin. So there's alot of shit we don't know much about during the time before X.
I'd like to see the world during Shuyin and Lenne's time too, before there was a Sin. The X world is full of shit we never saw that I'd really like to. Anothing thing I often pondered, if Tidus was dreamt up to resemble Shuyin, who was the dream of Jecht made in the image of? Possibly a new character to find in a prequel.
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