TH is home and brucas might have moved for abit BUT it must be an important reason...

anyways i could have imagine them growing old there, their kids going to school and them hanging with naley.

they def would stay in tree hill

Both Luke and Brooke contribute so much to TH especially as Brucas. They become the best versions of individuals while at the same time being in love with each other. The greatest contrast of LP and BL is that BL never stops being Brooke and Lucas as themselves while LP just becomes this one kind of flavor...they just overshadow each other that you can't feel neither Lucas nor Peyton as individuals whenever they become a couple (case in point is s6..they don't have lives outside each other anymore, unlike BL, which makes their relationship in s3 tons of interesting because they pursue interests that has nothing to do with them as cpuple particularly...like Naley with music and basketball.) So if things were different and they did get married, they'd be fun and hanging around NH and JP (Now Jeyton are the ones I see leaving, going on a road trip, ya know).