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

I believe the answer is: Colonists might not have declared independence

The main reason why the revolutionist managed to get support is because of the growing satisfaction among the colonists because of the high tax rate imposed by the British government.

If the parliament allow the colonist to tax themselves, thus satisfaction would dissapear and they would not be able to obtain soldiers from the colonists.

the answer is mass marketing.