You are paving the road to hell with nothing but the best of intentions good sir.
The road to hell was paved in 1949, when the FIM created competition that couldn't be regulated. All competition degenerates into stale contests between corporate giants, but regulatory bodies can break trusts, oligopolies, and monopolies if the competitors are not producing utility or economic progress. Does this regulatory phenomenon exist in MotoGP or any racing series? No. In fact, the manufacturers regulated themselves in MotoGP until recently.
What would you expect to be the result of creating competition without a potent regulatory body to force competition to exist? You'd probably expect the competition to be stale and unsustainable, and you'd expect it to produce almost nothing for society. Hey! That's sounds like racing. Many racing series have simply done away with manufacturer competition b/c they can't figure out how to make it work
Many series are already in hell, and MotoGP is getting closer by the day.