In Old English hūsbonda meant "master of a house". Further back still the word's origins are Old Norse ....hūsbōndi, from hūs house + bōndi householder; akin to Old Norse būa to inhabit.[...]
Should the growing number of same sex couples choose to start using terms like husband or wife, might that not have an organic evolutionary effect on the overall use of the word? In other words, might couples - straight or gay - a generation from now, feel equally comfortable using the terms with no historical baggage or gender politics associated with them?
Languages evolve with changes in society.
There's clearly an importance in the hierarchy of terms (very inconclusive listing) starting from friend -> significant other -> spouse.
I look forward to eventually being a husband in a two-husband household, after enjoying the possible temporary steps of FB, FWB, significant other, partner, and whatever appropriate applicable terms may apply or evolve. In reality the only important thing will be the interrelationship on the highest level possible.