Well, one GTA community member thought so to such an extent that they're currently busy re-creating what we've seen of the map so far in GTA 5, as a mod that Rockstar will hopefully be cool with.

Grand Theft Auto GTA 6 A modder is daring to recreate GTA 6's map in GTA 5, despite Rockstar owner Take-Two's recent spree of fan project shutdowns News By Issy van der Velde published January 29 ...

Good news, GTA fans: a dedicated modder has gone to great lengths to create a playable version of GTA 6's map in GTA 5. Bad news, GTA fans: Take-Two has already decided it's not having any of that ...