I agree with your addition. It’s true that issue referendums can turn into referendums on leaders. There seems little doubt that some people saw Brexit as a way to oust David Cameron as Prime Minister.
I get your point about Trump not being a new phenomenon. However, I would still consider 2011 relatively new. Most of the main protagonists on the Leave side of the EU Referendum have been touting their view for twenty years or more, and there were many other before them. Remember that the UK first had a referendum on remaining in what was then just the common market back in 1975. So, anti-EU feeling has been around for many, many years. Politicians associated with the Tea Party began getting elected from 2006–2008, so much more recently.
On a completely different note, liked your post as well. Columbia referendum a particularly interesting result.