I did some number crunching on online polls versus phone polls. The only way remain can lose in my opinion is by people not getting out and voting in same numbers as the leave side.
Which is an interesting conundrum. The most passionate Leave campaigners are absolute dead certs to vote because they are motivated by principle but there are also presumably a lot of disaffected, usually politically disinterested, people who are also Leave-leaning because they think that Brexit would somehow improve their lives. These people may not be particularly well motivated to turn out.
Still worried that it'll be a wafer thin margin to Leave