A Hunter's Bounty
No, forced paired instance only. This is a bounty, right? In old days bounty hunters worked alone or in pairs. Not in full groups.
This would be a great way to get unique items by forcing a pair to work together well. There are already group based content (dungeouns/fractals) and large group contant (guild hunts/wvw)…this system seems perfect to make it pair only and far closer to what bounty hunting was rather like. They could even make it sherlock holmes styled if they so chose due to pair only (holmes and watson) given they like to do parodies when able.
Well, what I had in mind was more along the lines of a hunting party than a bounty hunt, and forcing a smaller group size might cause some trouble with setting up the party mechanisms, I’d imagine, especially when in my draft the hunt starts in the open PvE zones. However, I do see your point, content aimed for two players would be cool indeed.