I wonder if this electoral debacle for the Socialists will encourage them to push through a change to proportional representation for National Assembly elections. IIRC that's what happened during Mitterand's first term, when to avoid a total electoral debacle in the 1986 National Assembly elections, PR was introduced.
No.
For one, proportional representation would have meant 20% of the parliament in FN hands and likely a hung parliament with PS-UMP as the only possible coalition.
Also, the current system benefits them far more than a proportional represenation system, largely because they siphon EELV and some FG votes in the second round. I imagine some centrist LR will also back them in the event of a PS-FN duel in the next legislation.
Also, have a look how many in the British Labour Party want a proportional representation system. Similar system to France.
This is actually a really good result for PS given the circumstances. They will hold on to their core and ride out the Hollande sh**tshow. They are still up there with UMP and FN, although most of the time 3rd. More importantly, the far left are nowehere.