LightSpectra
me autem minui
Would the revolution have happened without him? or would it just have taken longer to get people all roused up to support it?
He didn't even come to America until the end of 1774, well after the Thirteen Colonies had become outraged by the Intolerable Acts. His first major pro-independence publication was Common Sense in 1776, which was after the Revolution had de facto began.
The question is how many people became/remained contributing Whigs because of Thomas Paine, and that's somewhat unanswerable. I can tell you that very few people actually ascribed to Paine's political positions, since even the most radical members of the Democratic-Republicans had denounced Common Sense before the turn of the century.