Several things went wrong which could so easily have gone right in the 1745 rebellion - there was a ship captured by the English which was carrying money to fund the fighting - and when the Prince's advisers voted to turn back to the North instead of making for London it was mainly because they trusted the false report that there was an army of 9000 men in their way, but the information was from an English agent.

If there had been Stuart kings on the throne again I doubt that things would have turned out much different - not after 100 years or so.