Won't happen mate.
It's just not realistic. I do rate Vinicius very highly, but he's not a big enough name or a superstar where his development and what he brings to your team will be prioritized over someone like Mbappe.
Mbappe is a CF these days, barely plays off the left. Way more likely he will play RW or CF, even in a 4-4-2 the kind Carlo tried to shoehorn Hazard into to give him something to do. Vini never played RW and coach whoever it is won't kill a younger guy who creates more on ball.
If Mbappe ends up useless or awkward at RW, will probably be moved to CF within a year.
No superstar stuff needed, will come down to who loses less out of position.
In fact much like it is working out with Rodrygo who is a converted LW but works OK at RW and moving Vini there made him shite whenever it was tried
Pochettino even prefers Mbappe at CF and get Di Maria at LW when Neymar out AFAIK
Bar the Benzema partnership from France NT there's little reason to use Mbappe at LW when have such a weapon there already