i dont think it works like you think. i think you have to currently have it in your inventory for that to work.
i have yet to see something that allows me to trade "duplicate" gear at all because i usually vendor everything im not using from dungeons. and i get the same gear over and over
i think personal loot should be forced if a certain %age of the raid group is not of the same guild. guild groups should only be allowed to change loot rules
It doesn't work that way now, it will work that way in Legion. I initially thought it was open personal loot trading, but apparently it's only trading of duplicate items you already have.
That was basically what we did in HFC with trash drops since they made those personal loot.
If they want more people to use personal loot they should just continue to refine the system and make it better, but they definitely should not get rid of master loot. Sometimes you lose a tank or a healer and a raider needs to swap toons and quickly gear it up, this would be pretty terrible without the power of master loot.
I think a "Master loot with personal loot odds" would be beneficial to most guilds. Or even an "assigned personal loot" where you could flag people on encounters to get the rolls. Continued refinement is definitely needed, I agree. More options is always better.