Might get up to about 60% because of the "Boris factor". Whether you like him or hate him, there is no doubt that he entertains folk. And that's what the people want - "entertainment". I think the result is a foregone conclusion. Almost as boring as the AV referendum.
Most folk have very little interest in politics at all, even more have little or no interest in the EU. The folk who do have a wee bit of interest, probably don't have enough knowledge to make an informed decision. I include myself in that. 4 months is not enough time to educate a nation on how the EU works, especially when you consider how we know the media are going to cover it.