The referendum, as it is intended, helps people like me. I would, in theory, be able to claim children's allowance for by school aged children who live with me without going to court. As a divorced parent I could get the same additional income tax allowance that divorced women receive. My concern is that the unintended consequences could be many and expensive since we live in a rights based (but not responsibility based) society with a very generous welfare system.
It will also have major implications around inheritance tax for the children of blended families where the parents aren't married.
All that said I'm not sure that it's a good idea to discourage marriage.