With the current Switch model, I don't really think its possible, or at least, it would be EXTREMELY difficult to get a game like Final Fantasy XV, the REAL version, to run on it.
However, in a few years, whenever Nintendo introduces "Nintendo Switch+" that brings it to base PS4 and Xbox One levels or damn close to it, I think FFXV would be a damn great game to launch that revision with.
Hardware Comparison Threads:
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Is Hardware Getting TOO Powerful?
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PlayStation/Xbox/Switch: 2022 Edition
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017