WI Napoleon III dies in 1855?

I've seen some discussions before about the assassination attempt against Napoleon III carried out by Felice Orsini in 1858. But the Emperor was also almost shot three years before that attempt by other Italian, Giovanni Pianori: http://www.napoleon.org/EN/Template/newsletterPreview2.asp?idnewsletter=367

"Today [28 April], at about 5 o'clock, the Emperor was on horse back on the Champs-Elysées... At the level of the Château des Fleurs [near to current Rue Bassano], a well-dressed man came to within several paces of the Emperor and took a pistol shot [in fact two] at His Majesty. The Emperor was not hit, and after thanking the people who immediately surrrounded him, he continued his ride at a walk, heading off to meet the Empress who was riding in the Bois de Boulogne... The assassin was immediately stopped by the people who were near to him at the time and was handed over to the authorities..."

So, WI Pianori had killed Napoleon III in April 1855? He still didn't have a son, he there was no direct her to the throne. Would the Second French Empire fall and the Republic be proclaimed again? Could the monarchy be restored? And how could it affect the outcome of the Crimean War?
 
Plon Plon is on the left side of the bonapartist movement and a democrat anticlerical say the french wiki.
But I am not really knoledgeable on this subject. Any expert of the politic life of the french second empire around?
 
The presumptive heir was Prince Napoleon (Plon-Plon) between 1852 and 1856.

Plon Plon is on the left side of the bonapartist movement and a democrat anticlerical say the french wiki.
But I am not really knoledgeable on this subject. Any expert of the politic life of the french second empire around?

I thought about Plon Plon, but as was said above he was probably too leftist. Maybe Eugène Rouher? http://en.wikipedia.org/wiki/Eugène_Rouher
 
Rouher!? He was not part of any dynasty, nor linked to the Bonaparte. Although he is a conservative (moderate as he opposed the Catholic party), I think his loyalty to the House of Bonaparte would make him supporting Prince Napoleon. Anyway, he hadn't acquired in 1855 the importance that led him to be nicknamed 'Vice Emperor'.

Any people loyal to the House of Bonaparte would follow Prince Napoleon, as the Prince was chosen by Napoleon III as heir (seemingly, his father, Prince Jerome, the brother of Napoleon I, was too old). Through his father, he had friends in the Navy; he was not popular among high ranking officers of the Army, but from what I've read about his services during the Crimean War, he was popular rather among common soldiers.
Prince Napoleon was the head of the left wing Bonapartists. He was anti-clerical and was, no without good reasons, labelled (rather nicknamed) as 'Republican' by Napoleon III. Hugo and his family were among his friends, as Proudhon and George Sand, among other famous people.

If Napoleon III had been killed by Pianori, I think that the Republicans would attempt an uprising. It would be a short-lived attempt as they hadn't recovered from the coup of 51; what's more, the 'economical dictatorship' enacted after the coup had triggered a period of great prosperity (the first major crisis was in 1857).
The power struggle would be played between Royalists and Bonapartists.
The Royalists would have the support of several generals and other high ranking officers, of the Catholic conservatives (and reactionaries). However, they would suffer from the opposition between the Houses of Orleans and Bourbon.
 
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