Well i have just two points to think of when it comes to gay marriage:
1) Howard rewrote the constitution back in the 90's to say marriage was between a man and a woman only. If it's that easy to change then it's that easy to change it again.
2) Since gay people in a relationship can't be afforded the same rights as a married couple, when it comes to 9specifically) wills and legal ramifications, i find that a pretty big problem. Why can they not have the same legal rights as a married man and woman.