I'd actually bet the opposite. I think if you only gave people one vote, it's pretty much guaranteed that you'd see 3 then 2 for popularity. More options withou

I'd actually bet the opposite. I think if you only gave people one vote, it's pretty much guaranteed that you'd see 3 then 2 for popularity. More options without introducing rank would be the greatest gift you could give UKIP, whereas you'd lose the majority of remain (ie #4) votes to the flanking opinions of #2 for those wanting greater independence, and #5 for people who are more EU aligned. Thinking that most leave voters would go #2 only makes sense if you are thinking of the vote in the context of right now, not a year ago, when everything was more politically charged. I'd actually bet that had you suggested this a year ago, the people on the remain side would be loudly objecting to it, rather than the other way around.