Nice thought and not a stupid suggestion either, but not as simple as you put it
Have a look at the build scripts (github.com/volumio/Build) and see what actually has been packed into the base system and how many different integrated services eventually make up the “Volumio experience”.
To put that into one biiiiig package and start/stop it as a single service might remain a dream for a long time I guess :mrgreen:
Instead of that, the build system has been designed in such a way, that a lot of the porting efforts, known from earlier releases, has been reduced to a day (or two). Even with this, good suggestions to get it installed on a system, especially a range of x86 systems, other that flashing it to an sd card are always welcome.