What if the Ridolfi plot succeeded?

I was reading up on the Elizabethan era, and I found that it was chock-full of plots and conspiracies. One was the Ridolfi plot, a plot to assassinate Queen Elizabeth and replace her with Mary, Queen of Scots, and was only discovered through Elizabeth's intelligence network.
What would be the possible consequences if the Ridolfi plot were successful?
 
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