There's much of that out there, D&D 8C and the Kii 3s being quite popular.Exactly. Think of the KEF LS line, Genelecs or any similar system, brought together by RJ45 cables and perhaps a cd or turntable (sources, after all) plugged to a central speaker.
I don't see the "one box" ever really taking over the audiophile community.
Leaving all the lunitic fringe aside, I still prefer the basic separate boxes style myself. If one component dies, it's replacement
or repair is FAST and easy - peasy, as are upgrades of both hardware & software. What happens 5 years after the "one box manufacturer" goes belly up or dies?.
Lifestyle type gear definitely has it virtues, so does the traditional path.