SF think they're playing a clever game here - the SNP are the same. They think that by opposing Brexit they can show up the fault lines in the so called "United Kingdom" and move a little further towards their own agenda. The only trouble with that is when you constantly lie to people and deceive them, eventually they just regard you as a filthy liar and whore - not someone they could put their trust in.
France's future in the EU is far from certain and if France leaves than Italy will be close behind. I believe that the EU will have essentially dissolved in ten years time when a border poll will take place. I do think though that Brexit has made the totally crazed pro-Brussels faction in the ROI's Ruling Elite look upon the idea of a united Ireland again though; but are those the type of people you really want to be aligning yourselves with? Sometimes I think the Shinners would be happy if the whole of the Island became a State in the USA because it would mean the border going and NI leaving the UK.