The oap death-rate will probably do it, although the Australians think this will do away with the queen, only to find that as the next generation gets old they become the same. Sadly, the level of debate has forced people into either end of the argument with a huge vacuum in the middle where the vast majority of folk in such a narrow vote probably lie. Both the remain and leave campaigners largely play to their established and safe audience with nothing to generate converts. The nearest either side have come is with attempts to either generate fear of leaving or demonise the EU.
I've been watching a lot of debates from the early 70's (tons on youtube) prior to the first referendum, and although the issues are actually very similar the level of debate and the quality of political minds is miles ahead of todays tabloid/twitter fodder. This personally bothers me more than leaving or remaining as I feel politics has become a big brother or strictly come dancing style vote-off, with debate reduced to calling each other names and generally playing the man rather than the ball.