That would be great for new software, but what about older software that doesn't know about Pipewire? Can Pipewire mimick the presence of say Pulseaudio or Jack, so that one could safely uninstall them without breaking anything?
As an example, I installed Pipewire and other related packages, including pipewire-pulse, then proceeded to uninstall Pulseaudio, but the package manager complained that to continue I had to uninstall also gqrx-sdr, which is a software defined radio program that requires Pulseaudio as a dependency. In other words, to have everything working, I would still have to keep all old audio systems in place anyway, a scenario that reminds me that old xkcd cartoon about standards.