I don't plan on getting rid of my VPN mostly because I can depend on traffic funneling through it.
Private relay sounds like a great feature but because it excludes so much and you have no control over what data from which apps are using it, I'd rather not.
Also some apps that deal with streaming video, location services or whatever else, usually fail when using a VPN, I'd be worried about them also failing when using private relay when I didn't really intend to be using it, then adding to the struggle to disable it after realizing it must be the issue.