What might have happened if parliament had allowed the colonists to rule and tax themselves?

if Parliament had allowed the colonists to rule and tax themselves, it unquestionably would have put off the Revolution. One can think whether the Revolution would even happen, or would they just in the long run be permitted to end up just free with no battling like numerous different nations got their freedom politically and not by taking up arms. 

1. the spread of reform movements aimed at perfecting american society