I'd be okay with them doing HD upscaling of previous games. XIII had outstanding technical merits, but as long as they don't mess with the gameplay, writing, story, characters, plot, sidequests, or minigames, they can make it awesome.
My Console Library:
PS5, Switch, XSX
PS4, PS3, PS2, PS1, WiiU, Wii, GCN, N64 SNES, XBO, 360
3DS, DS, GBA, Vita, PSP, Android