Dude, I'm pretty sure you're panicking over nothing. Do you really think Bungie wouldn't take console exclusives into account?
I'll bet you this whole upgrade thing will only take into account the exotics you have on you/equipped, and not some random pool like what he sells. It could be an "Upgrade Exotic Weapon" and "Upgrade Exotic Armor" item in his menu that applies it to whatever you have equipped. Whatever the case, I highly doubt it's going to be like how he sells exotics now.
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Look at the picture of xûr's inventory. It's going to be exactly like how he sells exotics now, with him offering 6 weapons and 6 armors each week to upgrade. While there's only 20+ old exotics at the moment the 6 random weapons and 6 armor doesn't seem too bad... Until you remember xûr is the same guy who loves to sell the same item week after week (voidfang x5, sun breakers x4.) I dont get why people are thinking hes going to pull a list off of what exotics you have in your inventory at the time. Upgrade equipped exotics simply means that you must own the item first before you can upgrade it.