WI: Naples doesn't join the 3rd Coalition

What happens if Ferdinand IV of Naples abides by his treaty of neutrality in 1805 and doesn't join the War of the 3rd Coalition against France?
 
What happens if Ferdinand IV of Naples abides by his treaty of neutrality in 1805 and doesn't join the War of the 3rd Coalition against France?

4th coalition, not 3rd. He probably doesn't lose Naples for a while. However we could see Napoleon come for him sometime later in full force. However more likely Napoleon would let him stay.
 
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