Precisely!!!!
The "why bother" part is because of so many people saying (rightly or wrongly) that marriage cannot encompass same-sex unions, because it is fundamentally Christian and the Bible says homosexuality is wrong, and they will not allow government to endorse something which is anti-Christian.
So if the term "marriage" is the sticking point, remove it from the one place that requires a hard-and-fast definition. Let individuals (or churches) decide on their own definition, because there's no way those definitions will ever be compatible across a neighborhood, much less a state or a country.