How would they feel? Disappointed, I think. Disappointed that after learning that the Cause was ultimately successful, it has effectively been abandoned by almost all Posterity. However, I think that disappointment would be significantly greater had they been plucked from 1783 after knowing and experiencing the cost.
But I also think that if they were stuck here - that it was a one way trip, they'd get to work in the attempt to cultivate a value in Liberty much as they did in their own time. We are quick to resort to a dynamic remedy - tarring and feathering, burning pols in effigy, or the notion of a Second Amendment fix.
And though that will likely be necessary in the end, it's important to remember the American Revolution wasn't the Revolutionary War.
The War was
merely a consequence of the Revolution.
What exactly does that mean? In a letter to H. Niles in 1818, John Adams had this to say:
I feel like they would get to work rekindling the fires of Liberty....fanning the embers that remain into flame, then brushfires, then into massive conflagration.
Back in their day it was done in the taverns, in the town halls, in the streets and in the partisan press - the social media of the 18th century. It was there that the various caucus clubs met, shared, debated, and disseminated ideas. And despite
@HMP 's general scorn for social media - it does, on occasion, change people's minds. This place is a good example - I've seen people who were hardcore GOPers in 2012 become some of the most vocal "government sucks" folks around.
1776 was the year when the decade and a half of labor in sowing the seeds of Independence began to pay off - it was in 1776 when the fruits of 1775 became ripe.
Because in the end, it doesn't take a majority to prevail, just a sizeable enough minority to not fail. By the end of the Revolutionary War, more Americans were in the field fighting FOR the crown than against it, yet the pro-Independence crowd won.
I believe they would begin laying the groundwork to build an sizeable enough minority to effect change, and embuing that minority with enough faith and zeal to see things through, whatever costs may come.