We need a DLC that has more would-be spouses avaliable in the world.
We also need Wood-elves and Khajiit (heheh, no "furry" jokes, please

) partners too, as they seem to be the only 2 races that can't be wed.
Maybe also allow the thieves guild members allow marrying after the gulld quest is over.
Agreed, more Argonian spouses would be nice as well, only having three options in the world for my Argonian character and even then only one that will actually follow me on adventures is really irritating.
More spouses for all races is something we could do with to be honest, pickings may not be sparse but they're hardly interesting.
Would be nice to be able to get remarried as well, Ancient Dragons don't seem like big fans of matrimony from what I've heard. One of the reasons none of my character have become married is because you can't remarry after the death of your spouse. Plus if they do add new options via an expansion or DLC in future, I'd rather not have my level 81 character stuck with whatever option I chose in the original game if a better option presents itself in the expansions.