As an ex brit (10 yrs now) I want them to leave. As another poster said we were conned by that slimy b*****d Heath.
However I think the vote may be to stay. Many voting won't have known life without being in the EU and will vote for the apparently safe option to stay. The FUD being distributed by the stay campaigners will have an effect as well.
A close vote will be the worst of all results. A large proportion of the population will be extremely p****d off as it's a very emotive issue in the UK. I'd rather see the stay camp win by a large margin than have a close result.
I can, however, see the current form of the EU disintegrating because of major disagreements among member states. Also if Merkel and her French counterpart were replaced with more euro sceptical politicians the picture would be completely different.